Bibliografie tematiche / Feeding regimes

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Letteratura scientifica selezionata sul tema "Feeding regimes"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 28 gennaio 2023

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Articoli di riviste sul tema "Feeding regimes"

1

Quy, Ong Moc, Ravi Fotedar e Ho Thi Truong Thy. "Extension of Rotifer (Brachionus Plicatilis) Inclusions in the Larval Diets of Mud Crab, Scylla Paramamosain (Estampodor, 1949): Effects on Survival, Growth, Metamorphosis and Development Time". Modern Applied Science 12, n. 1 (24 dicembre 2017): 65. http://dx.doi.org/10.5539/mas.v12n1p65.

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Abstract (sommario):
The study evaluated the effects of extended dietary inclusions of rotifers (Brachionus plicatilis) on the survival, metamorphosis rate, growth and development time in the larvae of mud crabs (Scylla paramamosain). The five most commonly published feeding regimes of mud crab (S. paramamosain) larvae were selected and tested by including rotifers onto them. Mud crab larvae in the first feeding regime were fed exclusively with Artemia nauplii (control or regime A), while those in feeding regimes 2, 3, 4 and 5 were fed rotifers starting from zoea 1 (Z1) to various development stages of mud crab larvae whereas feeding with Artemia nauplii was commenced from the Z2 stage until the end of the trial (megalopa stage). The results of the larval feeding trial for 24 days of culture showed the progressive decrease in survival of the larvae in all feeding regimes. Extended inclusion of rotifer feeding until Z5 stage resulted in significantly higher survival than in the control from 18 day after hatching onwards. Larval survival was negatively correlated (R2 from 0.78 to 0.90) with the rearing time; however, different feeding regimes had no significant effect on this correlation. Extending inclusion of rotifer feeding until the Z3, Z4 and Z5 stages resulted in higher percentages of megalopa metamorphosis than in regime control, but did not significantly impact development time, carapace width, body length and wet weight of megalopa.
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2

Maré, Frikkie, e Henry Jordaan. "Industrially Finished Calves: A Water Footprint-Profitability Paradox". Water 11, n. 12 (5 dicembre 2019): 2565. http://dx.doi.org/10.3390/w11122565.

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Abstract (sommario):
The feed conversion rate is one of the most important determinants of the water footprint (WF) of beef and is known to vary between different cattle breeds. The objective of this study was to estimate the WF of industrially finished calves of seven different cattle breeds on two different feeding regimes: normal pre-determined feeding period (NPFP) and profit-maximising feeding period (PMFP). Data were collected by finishing 35 calves of each of the seven breeds in a feedlot. Green, blue and grey WFs were estimated for the different feeding regimes, and a feedlot simulation provided the effect of the different feeding regimes on the water footprint, financial margin and the water footprint per rand of margin. The results indicated that the water footprint differed notably between breeds on the same feeding regime, as well as between the feeding regimes. While the PMFP had a 1% higher water footprint per year in a typical feedlot than the NPFP, the financial margin was 33% more, resulting in a 24% decrease in the water footprint per South African rand of margin. The contributions of green, blue and grey water to the total WF were 91.5%, 2.5% and 6%, respectively, irrespective of breed or feeding regime.
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Morozova, Ievgeniia, Nadiia Nikulina, Hans Oechsner, Johannes Krümpel e Andreas Lemmer. "Effects of Increasing Nitrogen Content on Process Stability and Reactor Performance in Anaerobic Digestion". Energies 13, n. 5 (3 marzo 2020): 1139. http://dx.doi.org/10.3390/en13051139.

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Abstract (sommario):
The aim of this study was to analyse the effect of different nitrogen increase rates in feedstock on the process stability and conversion efficiency in anaerobic digestion (AD). The research was conducted in continuously stirred tank reactors (CSTR), initially filled with two different inocula: inocula #1 with low and #2 with high nitrogen (N) concentrations. Three N feeding regimes were investigated: the “0-increase” feeding regime with a constant N amount in feeding and the regimes “0.25-increase” and “0.5-increase” where the N concentrations in feedstock were raised by 0.25 and 0.5 g·kg−1, respectively, related to fresh matter (FM) every second week. The N concentration inside the reactors increased according to the feeding regimes. The levels of inhibition (Inhibition) in specific methane yields (SMY), related to the conversion efficiency of the substrates, were quantified. At the N concentration in digestate of 10.82 ± 0.52 g·kg−1 FM measured in the reactors with inoculum #2 and “0.5-increase” feeding regime, the level of inhibition was equal to 38.99% ± 14.99%. The results show that high nitrogen increase rates in feeding regime are negatively related to the efficiency of the AD process, even if low volatile fatty acid (VFA) concentrations indicate a stable process.
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Wei, Jing, Chong Zhao, Lisheng Zhang, Limeng Yang, Rantao Zuo, Shouquan Hou e Yaqing Chang. "Effects of short-term continuous and intermittent feeding regimes on food consumption, growth, gonad production and quality of sea urchin Strongylocentrotus intermedius fed a formulated feed". Journal of the Marine Biological Association of the United Kingdom 97, n. 2 (14 aprile 2016): 359–67. http://dx.doi.org/10.1017/s0025315416000448.

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Abstract (sommario):
Feeding regime is an important concern for sea urchin aquaculture. However, optimal feed regimes have not been established for land-based sea urchin ventures using a formulated feed. In this study, we investigated the effects of short-term continuous and intermittent feeding regimes on food consumption, growth, gonad production and quality of the sea urchin Strongylocentrotus intermedius (54.90 ± 2.28 mm of test diameter) fed a formulated feed. The results showed that (1) compared with initial conditions, all involved traits except a* (test diameter, test height, body weight, gonad weight, gonad index, gonad moisture, L* and b*) showed significant increase at the end of the experiments; (2) only the longest term feed regime tested in this trial (S2) significantly negatively affected growth and gonad production of S. intermedius fed a formulated feed; (3) there was a trend but this was not significant for inhibiting gonad development of S. intermedius in intermittent feeding regimes and there was no change in the gonad colour and sweetness; (4) S0.5 (fasting half day and then feeding half day) is the optimal intermittent feeding regime for S. intermedius fed a formulated feed. To our knowledge, the present study is the first report of finding an effective intermittent feeding regime for land-based cultured sea urchins of relatively large size, and thus has direct application potential in the field of aquaculture.
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Zhang, Qian, Tongqing Guo, Xungang Wang, Xiaoling Zhang, Yuanyue Geng, Hongjin Liu, Tianwei Xu, Linyong Hu, Na Zhao e Shixiao Xu. "Rumen Microbiome Reveals the Differential Response of CO2 and CH4 Emissions of Yaks to Feeding Regimes on the Qinghai–Tibet Plateau". Animals 12, n. 21 (30 ottobre 2022): 2991. http://dx.doi.org/10.3390/ani12212991.

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Abstract (sommario):
Shifts in feeding regimes are important factors affecting greenhouse gas (GHG) emissions from livestock farming. However, the quantitative values and associated drivers of GHG emissions from yaks (Bos grunniens) following shifts in feeding regimes have yet to be fully described. In this study, we aimed to investigate CH4 and CO2 emissions differences of yaks under different feeding regimes and their potential microbial mechanisms. Using static breathing chamber and Picarro G2508 gas concentration analyzer, we measured the CO2 and CH4 emissions from yaks under traditional grazing (TG) and warm-grazing and cold-indoor feeding (WGCF) regimes. Microbial inventories from the ruminal fluid of the yaks were determined via Illumina 16S rRNA and ITS sequencing. Results showed that implementing the TG regime in yaks decreased their CO2 and CH4 emissions compared to the WGCF regime. The alpha diversity of ruminal archaeal community was higher in the TG regime than in the WGCF regime. The beta diversity showed that significant differences in the rumen microbial composition of the TG regime and the WGCF regime. Changes in the rumen microbiota of the yaks were driven by differences in dietary nutritional parameters. The relative abundances of the phyla Neocallimastigomycota and Euryarchaeota and the functional genera Prevotella, Ruminococcus, Orpinomyces, and Methanobrevibacter were significantly higher in the WGCF regime than in the TG regime. CO2 and CH4 emissions from yaks differed mainly because of the enrichment relationship of functional H2- and CO2-producing microorganisms, hydrogen-consuming microbiota, and hydrogenotrophic methanogenic microbiota. Our results provided a view that it is ecologically important to develop GHG emissions reduction strategies for yaks on the Qinghai–Tibet Plateau based on traditional grazing regime.
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6

Cameron, N. D., e M. K. Curran. "Genotype with feeding regime interaction in pigs divergently selected for components of efficient lean growth rate". Animal Science 61, n. 1 (agosto 1995): 123–32. http://dx.doi.org/10.1017/s1357729800013606.

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Abstract (sommario):
AbstractThe genotype with feeding regime interaction was examined by testing pigs from four selection groups on both ad libitum and restricted feeding regimes. Within each selection group, there were high, low and control lines, which had been selected for lean food conversion ratio (LFC), daily food intake (DFI) or lean growth rate on ad libitum (LGA) or on restricted (LGS) feeding, in Large White-Edinburgh (LW) and Landrace-Wye (LR) populations. There were 1187 LW pigs and 768 LR pigs in the study, with 344 LW and 133 LR pigs tested on the alternative feeding regime.In the LW population, pigs in the high LGS line grew significantly faster than the high LGA and LFC lines with ad libitum feeding (919 v. 847 and 786 (s.e.d. 31) g/day), but had similar food conversion ratios and backfat depths. The high LGS and high DFI lines were similar for growth rate, daily food intake and food conversion ratio, but backfat depth was significantly lower in the high LGS line than in the high DFI line (12·0 v. 25·9 (s.e.d. 0·7) mm). On restricting feeding, the rankings of the selection lines for growth rate, food conversion ratio and mid-back fat depth were broadly similar to those with ad libitum feeding, except for the high LFC line. In the LR population, the high LGS, LGA and LFC lines did not differ significantly in growth rate, daily food intake, food conversion ratio and backfat depth within either the ad libitum or restricted feeding regimes. Growth rate of the high LGS line was similar to the high DFI line on ad libitum feeding (828 v. 836 (s.e.d. 40) g/day), but significantly higher on restricted feeding (704 v. 636 (s.e.d. 23) g/day). On both feeding regimes, food conversion ratio and backfat depth were significantly lower in the high LGS line compared with the high DFI line.In the LW population, the genetic correlation between feeding regimes for growth rate was significantly less than one (0·4 (s.e. 0·20)), but was not significantly different from unity (0·8 (s.e. 0·14)) for backfat depths. Based on the performance test results, selection for lean growth with testing on a restricted feeding regime may be preferable to testing animals on an ad libitum feeding regime.
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7

Gandra, André L., Daniel R. Ituassú, Manoel Pereira-Filho, Rodrigo Roubach, Roger Crescêncio e Bruno A. S. Cavero. "Pirarucu growth under different feeding regimes". Aquaculture International 15, n. 1 (7 ottobre 2006): 91–96. http://dx.doi.org/10.1007/s10499-006-9064-z.

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8

Spengler, Daniel E., Travis W. Schaeffer, Casey W. Schoenebeck e Michael L. Brown. "The Influence of Symmetrical Feed:Fast Regimes on Oxytetracycline Uptake and Otolith Score in Yellow Perch". Open Fish Science Journal 6, n. 1 (29 novembre 2013): 92–98. http://dx.doi.org/10.2174/1874401x01306010092.

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Abstract (sommario):
Periods of growth from symmetric feed:fast regimes (i.e., days fed followed by the same number of days fasted) may increase the uptake of oxytetracycline (C22H24N2O9 .HCL[OTC]) compounds in fishes; however, little empirical data exists. Therefore, we experimentally determined if such feeding regimes influenced the concentration of OTC incorporated in muscle and skeletal (e.g., otoliths) tissues. Individually-reared female and batch-reared (male and female), age-1 yellow perch Perca flavescens were subjected to one of four experimental feeding regimes: control (i.e., fed daily), D2 (i.e., 2d feed, 2d deprivation), D6, or D12 symmetrical feed:fast regimes. Following several feeding cycles on these feeding regimes, fish were submersed in a 600mg/L buffered OTC solution; otoliths and muscle tissue were excised and processed to determine OTC uptake via mark quality and concentrations. Ranked otolith scores (mark quality) were significantly lower for the D2 feeding regime than control, D6, and D12 scores for both individual and batch trials suggesting that frequent food deprivation restricts osteogenesis, while daily or extended feeding periods contribute to osteogenesis. In batch-reared fish, total OTC and 4-epioxytetracycline peak concentrations in muscle tissue did not significantly differ among treatments but were significantly greater for smaller individuals within treatments suggesting that the OTC uptake and elimination response is mechanistically related to higher gill ventilation volume and gastric ingestion rate of small fish providing increased chemical assimilation and decreased clearing time following OTC immersions. Increased otolith mark quality derived from such feeding protocols may be of particular interest to fisheries managers conducting stock contribution assessments of yellow perch, but this induction strategy may apply to other species as well as therapies for hatchery stocks.
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9

Simmins, P. H., S. A. Edwards, H. H. Spechter e J. E. Riley. "Effect of feeding regime during rearing and subsequent pregnancies on body conditions and reproductive performance of sows over the first four parities". Proceedings of the British Society of Animal Production (1972) 1991 (marzo 1991): 6. http://dx.doi.org/10.1017/s0308229600019589.

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Abstract (sommario):
Greater demands have been imposed by present-day management practices on the modern dam with gilts being bred at younger ages and lower levels of back fat. This has raised questions over whether current rearing feeding practices and low pregnancy feeding regimes may have adverse influences on lifetime reproductive performance. The objectives of this experiment were to compare the reproductive performance of sows given different feeding regimes during rearing and pregnancy. Data previously reported from the experiment have shown that the weight and back fat depth of the gilt can be manipulated by feeding regime during rearing and pregnancy (Simmins et al. 1989). Sows reared on lower feed levels were more prolific in their first two litters but they also had longer farrowing intervals (Edwards et al. 1989). Further results up to the fourth parity are described here.
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Mulat, Daniel Girma, H. Fabian Jacobi, Anders Feilberg, Anders Peter S. Adamsen, Hans-Hermann Richnow e Marcell Nikolausz. "Changing Feeding Regimes To Demonstrate Flexible Biogas Production: Effects on Process Performance, Microbial Community Structure, and Methanogenesis Pathways". Applied and Environmental Microbiology 82, n. 2 (23 ottobre 2015): 438–49. http://dx.doi.org/10.1128/aem.02320-15.

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Abstract (sommario):
ABSTRACTFlexible biogas production that adapts biogas output to energy demand can be regulated by changing feeding regimes. In this study, the effect of changes in feeding intervals on process performance, microbial community structure, and the methanogenesis pathway was investigated. Three different feeding regimes (once daily, every second day, and every 2 h) at the same organic loading rate were studied in continuously stirred tank reactors treating distiller's dried grains with solubles. A larger amount of biogas was produced after feeding in the reactors fed less frequently (once per day and every second day), whereas the amount remained constant in the reactor fed more frequently (every 2 h), indicating the suitability of the former for the flexible production of biogas. Compared to the conventional more frequent feeding regimes, a methane yield that was up to 14% higher and an improved stability of the process against organic overloading were achieved by employing less frequent feeding regimes. The community structures of bacteria and methanogenic archaea were monitored by terminal restriction fragment length polymorphism (T-RFLP) analysis of 16S rRNA andmcrAgenes, respectively. The results showed that the composition of the bacterial community varied under the different feeding regimes, and the observed T-RFLP patterns were best explained by the differences in the total ammonia nitrogen concentrations, H2levels, and pH values. However, the methanogenic community remained stable under all feeding regimes, with the dominance of theMethanosarcinagenus followed by that of theMethanobacteriumgenus. Stable isotope analysis showed that the average amount of methane produced during each feeding event by acetoclastic and hydrogenotrophic methanogenesis was not influenced by the three different feeding regimes.
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Più fonti

Tesi sul tema "Feeding regimes"

1

Noble, Christopher. "Feeding efficiency and aggression in juvenile Atlantic salmon, Salmo salar (L.) under alternative feeding regimes". Thesis, University of Glasgow, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392646.

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2

Sandhaus, Estelle Ann. "Variation of Feeding Regimes: Effects on Giant Panda (Ailuropoda melanoleuca) Behavior". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7617.

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Abstract (sommario):
Giant pandas in captivity are typically fed discrete amounts of highly concentrated food on a fixed time schedule, in addition to limited amounts of fresh bamboo throughout the day. In response to informal observations that these animals engage in a number of undesirable behaviors just prior to the predictable feeding of concentrated meals, we examined the existing feeding regime at the Research Base of Giant Panda Breeding in Chengdu, Peoples Republic of China. We sought to determine whether undesirable behaviors were occurring more frequently before the delivery of meals than at other times of day and whether modified feeding regimes would result in a more species-appropriate activity budget overall. As predicted, female giant pandas spent significantly more time engaged in door-directed/human-oriented behavior, stereotypic behavior, and non-stereotypic locomotion in the 30-minute periods prior to the feeding of concentrated meals. When placed on a modified feeding schedule in which frequency of bamboo provisioning was increased (total amount was held constant), significant differences were not found between study phases for the above-mentioned behaviors of interest, though a visual trend towards a decline in stereotypic behavior during the experimental phase was noted. Male pandas, when placed on a less predictable feeding schedule, did not exhibit significant behavioral differences in behaviors of interest between experimental phases or observation periods. These findings may be attributable in part to the low power inherent in the small sample size. However, visual trends that may be indicative of feeding anticipatory activity (FAA) were apparent. It appears that giant pandas, like many other animal species cited in the literature, are sensitive to periodic feeding regimes, though it is less clear as to which regime modifications will prove most beneficial.
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3

Savelli, Ilaria. "Rhythms of anorexigenic neuropeptides in senegalese sole: Effects of light, feeding regimes and developmental stage". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8405/.

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Abstract (sommario):
Increasing knowledge on the endocrine mechanisms that regulate feeding and growth in cultured fish can contribute to make improvement in fish holding conditions and feeding strategies, supporting the development of new techniques that could ameliorate feeding, food conversion efficiency and growth in aquaculture practice. The main objective of this study was to investigate how daily mRNA expression of three specific anorexigenic hormones, i.e. the corticotropin-releasing hormone (CRH) and the paralogues α- and β- proopiomelanocortin (POMC), is modulated by different photoperiods, light spectra and feeding regimes, in both adult and larvae of Solea senegalensis. In addition, as Senegalese sole exhibits a shift from diurnal to nocturnal in locomotor activity and feeding habits during metamorphic process, we tried to elucidate if this shift is accompanied by relevant daily variations in the expression of these anorexigenic hormones before, during and after the completion of metamorphosis. In order to reach this main objective, three main experiments were developed. In a first experiment, adults were reared under LD (12 h light: 12h dark) cycle and fed at mid-light (ML), mid-dark (MD) and at random (RND). In a second experiment, adult specimens were reared in constant darkness (DD) and fed at subjective mid-light (sML) or at RND. Larvae of Senegalese sole were reared under LD cycle with white, blue or red light for 40 days. Our results show an independence of crh mRNA expression from the feeding time and suggest an endogenous control of crh expression in sole. Both pomc paralogues showed significant daily rhythms under LD conditions. The rhythms were maintained or were even more robust under DD conditions for pomc_a, but were completely abolished for pomc_b. Our results indicate an endogenous control of pomc_a expression by the molecular clock in telencephalon and diencephalon, but not in the pituitary gland. Our findings confirm for the first time the significant influence that ambient lighting has on larval growth and development in Senegalese sole, revealing an important effect of light spectra upon functional elements of this species. Our results also emphasize the importance of maintaining cycling light-dark conditions of the adequate wavelengths in aquaculture practices during early development of sole.
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4

Balfour, Robert Andrew. "Differences in the growth of the wolf spider Hogna helluo (Araneae : Lycosidae) reared under high and low food quantity diets". Oxford, Ohio : Miami University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1078419602.

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5

Marynowska, Martyna. "Unravelling the termite digestion process complexity - a multi-omics approach applied to termites with different feeding regimes". Doctoral thesis, Universite Libre de Bruxelles, 2020. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/304812.

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Abstract (sommario):
With its unique consortium of microorganisms from all domains of life, termite gut is considered one of the most efficient lignocellulose degrading systems in nature. Recently, host diet and taxonomy as well as gut microenvironmental conditions have emerged as main factors shaping microbial communities in termite guts. The aim of this thesis was to investigate this highly efficient lignocellulolytic system at holobiont level, with a particular focus on gut microbiome function and composition in relation to the host diet. As a starting point, we optimised a complete framework for an accurate termite gut prokaryote-oriented metatranscriptomics, which was at the basis of all subsequent sequencing assay designs and analyses performed in the course of the work. Afterwards, we characterised the compositions and functions of biomass-degrading bacterial communities in guts of plant fibre- and soil-feeding higher termites, proving the existence of functional equivalence across microbial populations from different termite hosts. We also showed that each termite is a reservoir of unique microorganisms and their accompanying genes. We further extended above approach to metagenomics and bacterial genomes reconstruction and we applied it to explore the process of biomass digestion in the different sections of the highly compartmented gut of soil feeding Labiotermes labralis. We showed that primarily cellulolytic activity of the termite host was restricted to foregut and midgut, while bacterial contribution was most pronounced in P1 and P3 hindgut compartments and included activities targeting broad range of lignocellulose components. Finally, we investigated the adaptation of a laboratory-maintained grass-feeding higher termite colony of Cortaritermes spp. to Miscanthus diet at host and symbiont levels. A natural system of a termite gut was shown to progressively change in composition to yield a consortium of microbes specialised in degradation of a specific biomass. Overall, the integrative omics approach proposed here provide a framework for a better understanding of a complex lignocellulose degradation by a higher termite gut system and pave a road towards its future bioprospecting.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
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6

Nguyen, Van Tuan. "An evaluation of the feeding regime for larval mahimahi (Coryphaena hippurus Linnaeus 1758) and cobia (Rachycentron canadum Linnaeus 1766)". Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/264.

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Abstract (sommario):
A series of five trials were conducted with an aim to evaluate the effects of different feeding regimes on the growth performance and survival of mahimahi and cobia larvae. The five feeding regimes were (1) delayed first feeding to mahimahi larvae, (2) rotifer and probiotic inclusions in live feeding regimes as practiced by industry on mahimahi larvae, (3) delayed first feeding to cobia larvae (4) copepods, Artemia and probiotic inclusions in live feeding regimes on cobia larvae, and (5) early weaning of cobia larvae to microdiets.Delayed first feeding for 0, 1, 2, 3 days and totally starved mahimahi larvae as well as delayed first feeding for 0, 1, 2, 3, 4 days and totally starved cobia larvae significantly influenced (P<0.05) the first feeding response, growth performance and survival of mahimahi and cobia larvae. Mahimahi and cobia larvae withstood starvation and maintained their high first feeding response for 2 and 3 days, respectively, after the day the yolk-sac was exhausted (2 day post hatch (DPH)), but the first feeding response significantly decreased (P<0.05) at the later stages. Delayed first feeding negatively affected the larval survival of both mahimahi and cobia larvae after 7 and 6 DPH, respectively. Negative influences in both larval species were also found in the growth performances in terms of length, wet weight, specific growth rate length and weight (SGRL and SGRW), head height, width, eye diameter, mouth depth and mouth width after 7 DPH. However, no influence on mahimahi and cobia larvae was observed when these larvae were fed 0 and 1 day delayed first feeding, except in cobia larval survival after 9 DPH (P>0.05).Provision of rotifers, enriched Artemia, and the combination of rotifers and enriched Artemia as the first feeding and Sanolife Mic probiotics added to water did not influence (P>0.05) the growth performance (length, wet weight, SGRL and SGRW), body indices (Head weight index and dry matter content) and survival of mahimahi larvae during the first 28 DPH. At 28 DPH, the survival of mahimahi larvae was 4.3- 6.0%. Meanwhile, the length, wet weight, SGRL and SGRW were 25.2-26.7 mm, 170- 190 mg, 6.1-6.3% and 21.7-22.0%, respectively.Dietary copepods and copepods plus Maz-zal added to water resulted in significantly higher (P<0.05) survival of cobia larvae (4.7 and 4.3%, respectively) than dietary enriched and un-enriched Artemia supplementation (3.0 and 1.4%, respectively) at 37 DPH (P<0.05). The effect of copepods, enriched and un-enriched Artemia inclusions in live feeding regimes on the growth performance (length, wet weight, SGRL and SGRW) of cobia larvae were significantly different (P<0.05) based on the larval stages. For example, at 16 DPH the growth performance of cobia larvae fed copepods was higher than larvae fed enriched and un-enriched Artemia, but lower values were observed at 23 DPH. At the end of the trial (37 DPH), the lowest wet weight and SGRW were observed in cobia larvae fed un-enriched Artemia (1717 mg and 22.7%). There was no influence of probiotic inclusion on the survival of cobia larvae though the total Vibrio count in water was significantly reduced during the rearing period. Similarity, the length, wet weight, SGRL and SGRW of cobia larvae fed copepods and copepods plus probiotics added to water were similar at 35 DPH (87-90 mm, 2016-2204 mg, 8.4- 8.5% and 23.2-23.4%, respectively).Early weaning of cobia larvae to microdiets resulted in lower survival due to cannibalistic mortality, but higher growth performance was achieved. The survival of 30 DPH cobia larvae fed first microdiets at 16 DPH was 3.5% and significantly lower (P<0.05) than those of larvae fed first microdiets at 19 and 22 DPH (5.6 and 5.9%, respectively). In contrast, the growth performances (length, weight, SGRL and SGRW) of 30 DPH larvae given first microdiets at 16 DPH were significantly higher (P<0.05) than those of larvae given first microdiets at 19 and 22 DPH. Early weaning to microdiets at 16 DPH increased the cannibalistic mortality of cobia larvae in third and fourth weeks by around 200% than larvae fed first microdiets at 19 and 22 DPH. No significant difference (P>0.05) in the growth performance and survival were observed when cobia larvae were first provided microdiets at 19 and 22 DPH. In summary, later weaning of cobia larvae to microdiets (19 and 22 DPH) did not influence the growth and survival, and early provision of microdiets to cobia larvae (16 DPH) increased the growth performance but decreased the survival due to cannibalistic mortality.
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7

Steyn, Willem Johannes. "Effects of ad libitum and restricted diets in different feeding regimes on growth and carcass attributes of boars of a selected genetic line". Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/27678.

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The current modern commercial pig is an animal that has evolved through deliberate breeding programs, controlled environmental influences and nutrition to yield a highly efficient feed converter and fertile animal. The objective of this study was to measure the growth performances and carcass characteristics of entire male grower – finisher pigs which were subjected to different seasonal variations, nutrient dense diets, feeding regimes and group situations under South African circumstances. Period 1 was conducted in the winter from 6 June 2008 to 13 August 2008 and Period 2 in the summer from 3 October 2008 to 10 December 2008. The sire lines that were selected for the experiment had the same genetic breeding values (Topigs Selection Index value), of which two sire lines were the same in both Period 1 and Period 2 and one of two different sires lines was used either in Period 1 or Period 2. The animals were fed two different rations, a high (FH) and a low ration (FL), with the low ration’s specifications being 95 % of the high ration. The animals were randomly allocated three different feed regimes throughout the trial; restricted single feeding (RSF), ad libitum single feeding (ASF) and ad libitum group feeding (AGF). In the winter animals had a greater growth response compared to the summer, with end weight and average daily gain being significant (P<0.05) higher. A significant (P<0.05) improvement in average daily gain, feed efficiency and protein deposition rate were observed when animals were fed a higher energy and protein content in their diet, especially during summer. A significant (P<0.05) improved feed conversion was observed for restricted animals, but end weight, average daily gain and average protein deposition rates were significant (P<0.05) lower compared to ad libitum group and individually fed animals. In conclusion; the impact of decreasing the nutrient density of the diet for growing pigs through incremental changes in diet composition had a variable impact on overall growth performance and carcass quality. Feeding the high energy and protein ration improved growth performance during summer, but also in the initial stages of growth when feed intake capacity was limited. The objective when formulating diets should be to provide the essential amino acids and energy in amounts needed to support maximal and efficient growth. Using growth models estimated optimal feed intake curves will not deliver optimal results. Only when measuring and calculating the actual feed intake and protein deposition rates optimal performance levels will be reached. Measurements of feed intake and growth performance data derived from pigs penned individually should be adjusted before they can be applied to commercial situations or research conditions in which pigs are penned in groups.
Dissertation (MSc(Agric))--University of Pretoria, 2011.
Animal and Wildlife Sciences
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Guidi, Costanza. "Effects of photoperiod and feeding regimes on Neuropeptide Y (NPY) and Agouti-related Protein (AgRP) expression in central areas of senegalese sole, Solea senegalensis". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10102/.

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In the present study, we have tried to expand our knowledge about the endocrine mechanisms that regulate feeding and growth in cultured fish, which could be relevant for the improvement of fish farming conditions and feeding strategies. In order to reach this goal, we have investigated some orexigenic hormones, Neuropeptide Y (NPY) and the paralogues of Agouti-related protein, (AgRP1, AgRP2) in Solea senegalensis, an important species for Mediterranean aquaculture. We focused on hormones synchronization to different feeding regimes (diurnal vs nocturnal and random feeding) and photoperiod (light-dark cycle vs constant darkness). Therefore, the achieved results could also be relevant from a chronobiological perspective. Solea senegalensis specimen were reared in two different photoperiods, i.e.LD Light-Dark conditions as well as in DD conditions (constant darkness) along with different feeding regimes (fed at ML, Med and RND times), so to determine if mRNA expression of orexigenic hormones (NPY, AgRP1 and AgRP2) are entrained by feeding time and/or photoperiod. Our results show an independence of npy mRNA expression from the feeding time and suggest an endogenous control of npy expression in telencephalon of sole, while in optice tectum, npy expression could be entrained by the light-dark cycle. Our results on Senegalese sole AgRP1 and AgRP2 showed the same pattern of expression, indicating that expression of AgRPs is related to photoperiod in optic tectum, instead to feeding time. However the involvement of AgRP1 and AgRP2 in feeding behaviour should not be discarded in sole, as further research will be carried out with specimens maintained under different fasting conditions. our results reinforce the role of the telencephalon as the main neural area involved in the neuroendocrine control of food intake in fish, where endogenous NPY rhythms have been found, while diencephalon statistical variations weren’t observed suggesting that this brain area could be less involved in the neuroendocrine control of food intake in fish than previously thought.
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Al-Asfoor, Husam [Verfasser]. "Effects of Different Feeding Regimes on the Digestibility and Faecal Excretion of Nitrogen, Soluble Carbohydrates and Fibre Fractions in Water Buffaloes kept under Subtropical Conditions / Husam Al-Asfoor". Kassel : Universitätsbibliothek Kassel, 2010. http://d-nb.info/1008601756/34.

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Cyrus, Mark Digby. "The use of ULVA as a feed supplement in the development of an artificial diet and feeding regimes to produce export quality roe from the sea urchin Tripneustes gratilla (Linnaeus)". Doctoral thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/8719.

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Includes bibliographical references.
Tripneustes gratilla is a fast growing, shallow water echinoid, which occurs across the Indo-Pacific, with its south-western limit in warm, temperate waters of South Africa. The success of T. gratilla cultivation depends, in part, on the development of a high quality, costeffective, gonad-conditioning diet that can produce large, marketable quality gonads. The aim of this research was to determine whether Ulva supplementation would improve palatability, consumption and digestibility of an artificial feed administered to T. gratilla and optimise gonad production and quality. At an inclusion level of 20% (20U), Ulva was shown to significantly (p < 0.05) improve the attractiveness and palatability of a formulated feed, compared to a nutritionally equivalent feed that had not been supplemented with dried Ulva (0U). Food consumption rates (FCR) and apparent digestibility coefficients (ADC %) for protein and energy, using insoluble ash as an indigestible marker, were measured for all experimental diets. FCR was significantly higher (p < 0.05) for urchins fed artificial feeds supplemented with Ulva, when compared to urchins fed non-supplemented feeds, suggesting that the inclusion of Ulva into the artificial diets acts as a feeding stimulant.Increased palatability and consumption subsequently led to significantly increased protein retention in urchins fed the 20U diet. The addition of Ulva to artificial feeds also significantly improved gonad colouration duringgonad enhancement trials. Gonad lightness (L*), redness (a*) and yellowness (b*) were quantified using a hand-held reflected-light, fibre-optic spectrophotometer and showed that, at an inclusion level of 20%, Ulva produced gonads that did not differ in colouration from those fed a natural diet of fresh Ulva (FU), and significantly improved gonad colour, particularly gonad yellowness (b*), compared to the same artificial diet without Ulva supplementation. This response was likely related to Ulva's high β-carotene content. The Ulva content of artificial feed significantly improved gonad colouration, while the formulated portion of the feed produced significantly larger gonads than those produced using a natural diet of fresh Ulva. The 20% Ulva inclusion diet, in particular, increased the gonad somatic index (GSI) by 205%, in just nine weeks (7.6 to 23.3%), compared to a 57% increase in the control group (fresh Ulva). Full life-cycle growth trials were also conducted using two of theformulated feeds (20U & 0U), as well as fresh Ulva, to establish appropriate feeding regimes thatcould produce a harvestable product in the shortest time. During grow out, juvenile somatic growth needs to be maximised until an individual reaches marketable size and sexual maturity, which is followed by gonad enhancement, through nutritive cell development,aimed to maximise gonad yield and quality before harvest. The effects of 5 different feeding regimes on somatic and gonadal growth of juvenile T. gratilla were investigated, over a 32 week period. The feeding regimes used were: fresh Ulva (FU) only; fresh Ulva for 20 weeks and the 20U diet for 12 weeks (FU-20U); fresh Ulva – 0% Ulva (FU-0U); 20% Ulva – fresh Ulva (20U-FU) and 0% Ulva – fresh Ulva (0U-FU). Somatic growth was largely effected by the presence of Ulva within a diet. Similar growth, in diameter, of juvenile urchins was achieved using either an artificial diet containing Ulva (20U) or fresh Ulva (FU), during the somatic growth phase.An artificial diet with the same nutritional properties but without Ulva supplementation (0U) produced urchins that were significantly (p > 0.05) smaller. Gonad production in the somatic growth phaseof the trial was higher for urchins fed with artificial diets (0U & 20U), but the reduced size of urchins in the 0U diets significantly reduced gonad mass. After the diets were changed from artificial feeds (0U & 20U) to fresh Ulva (FU) and vice versa (week 20), both gonad size and colour were affected, with artificial diets promoting gonad growth, while FU improved gonad colour. At the end of the study, all feeding regimes produced similar amounts of gonad, except for those individuals that were fed the 0U feed during the somatic growth phase (which were significantly (p > 0.05) smaller). Gonad colourationof all treatments at the end of the study was of marketable quality. From these results it is recommendedthat FU be fed inthe somatic growth phase, while the 20U artificial diet should be used to increase gonad size, and optimise gonad colour, in the gonad enhancement phase. Through the use of stable isotope mass spectrometry and IsoSource, a mixing and mass balance model, the relative contribution and importance of specific feed ingredientsto gonad production was determined. Ulva was shown to be an important isotopic source for gonad production, accounting for an average of 33% of the isotopic signal across all Ulvacontaining, diets at the end of the trial. The final section of work focused on efforts to manipulate the gametogenic cycle of T. gratilla, by altering daylength, to attempt to reduce the production of large amounts of gametes, which would decrease gonad value. Histology indicated that urchins exposed to a Short day (8:16 h) were significantly more advanced reproductively, with the majority of urchins in a mature or spent state compared to urchins exposed to a Long day (16:8 h), which were mostly premature. Nutritive phagocyte (NP) density within the gonads supported the findings from histology, as gonads from urchins exposed to a short day had significantly less NP's (21.58 ± 4.35%), compared to the Long day treatment (65.26 ± 3.09%). The results from this study suggest that urchins of this species exposed to Long days progress through gametogenesis more slowly than those exposed to Short days, which, appeared to mature more rapidly. These findings could allow for the production of a high quality product for longer periods of the year, without the onset of gonad maturation. The research in this thesis clearly shows that the use of the macroalga Ulva as a feed, or feed additive, to artificially formulated, high protein feeds can have a number of significant benefits in echinoculture. The use of the artificial feeds and feeding regimes developed in this work, along with the ability to manipulate daylenth to suspend gametogenisis, could greatly facilitate the success of the newly developing T. gratilla industry, both in South Africa and worldwide.
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Libri sul tema "Feeding regimes"

1

Specified gas emitters regulation: Quantification protocol for including edible oils in cattle feeding regimes. 2a ed. [Edmonton]: Alberta Environment, 2008.

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Specified gas emitters regulation: Quantification protocol for including edible oils in cattle feeding regimes. [Edmonton]: Alberta Environment, 2007.

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McCabe, Christine A. A comparison of enteral feeding regimen in critically ill patients. [S.l: The Author], 1994.

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1936-, Blackburn George L., Bell Stacey J e Mullen James L, a cura di. Nutritional medicine: A case management approach. Philadelphia: Saunders, 1989.

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McDowell, L. R. Minerales para ruminantes en pastoreo en regiones tropicales. 3a ed. Gainesville: University of Florida Press, 1997.

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FAO-CIHEAM Inter-regional Cooperative Research and Development Network on Sheep and Goats. Sub-network on Nutrition. Seminar. Nutrition and feeding strategies of sheep and goats under harsh climates: Proceedings of the 9th Seminar of the Sub-network on Nutrition of the FAO-CIHEAM Inter-regional Cooperative Research and Development Network on Sheep and Goats. A cura di Ben Salem Hatem, Nefzaoui Ali, Morand-Fehr P. (Pierre), Centre international de hautes études agronomiques méditerranéennes e Maʻhad al-Qawmī lil-Buḥūth al-Zirāʻīyah al-Tūnisīyah. Paris: CIHEAM, 2004.

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Kepler, Courtney Robert. Economic comparisons of selected cattle feeding regimes. 1985.

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Nelson, Stuart A. An economic analysis of alternative winter feeding regimes of cow herds in north central Washington. 1991.

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Morris, Joseph E. Role of artificial feeds and feeding regimes on the culture of hybrid striped bass fry. 2010.

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Blackburn, George L., James L. Mullen e Stacey J. Bell. Nutritional Medicine: A Case Management Approach. W.B. Saunders Company, 1989.

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Capitoli di libri sul tema "Feeding regimes"

1

Farina, Felice. "Japan in the International Food Regimes: Understanding Japanese Food Self-Sufficiency Decline". In Feeding Japan, 363–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50553-4_14.

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Carter, Pam. "Control and Resistance in Infant Feeding Regimes". In Feminism, Breasts and Breast-Feeding, 189–213. London: Palgrave Macmillan UK, 1995. http://dx.doi.org/10.1057/9780230389533_7.

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Pill, J., F. Hartig, L. Dörge, N. Tran, L. Skatulla e J. Metz. "Arteriosclerosis in rabbits under different feeding regimes and the influence of Daltroban". In Arteriosklerotische Gefäßerkrankungen, 371–79. Wiesbaden: Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-663-19646-4_42.

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Jentzsch, Hanno. "Subsidized Tradition, Networks, and Power: Hamlet Farming in Japan’s Changing Agricultural Support and Protection Regime". In Feeding Japan, 413–42. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50553-4_16.

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Peng, Qiuping, e David R. Huggins. "No-Till Farming for Managing Soil Organic Matter in Semiarid, Temperate Regions". In Soil Organic Matter and Feeding the Future, 365–406. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003102762-15.

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Chaix, Amandine. "Time-Restricted Feeding and Caloric Restriction: Two Feeding Regimens at the Crossroad of Metabolic and Circadian Regulation". In Methods in Molecular Biology, 329–40. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2249-0_22.

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Day, John W., e Charles Hall. "Feeding America’s Cities: Putting Food on the Table in the Twenty-First Century". In America’s Most Sustainable Cities and Regions, 217–53. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3243-6_8.

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Baltzinger, Christophe, Ushma Shukla, Lindelwa S. Msweli e Colleen T. Downs. "Ungulates as dispersal vectors of non-native plants." In Plant invasions: the role of biotic interactions, 105–37. Wallingford: CABI, 2020. http://dx.doi.org/10.1079/9781789242171.0105.

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Abstract Ungulates are present worldwide with 257 recorded species, including livestock. They cover different functional gradients, be it feeding regime, digestive strategy, body size, body mass, fur characteristics or sociality. All these specificities may intervene at different stages of animal-mediated plant dispersal. Ungulates move diaspores from both native and non-native plants, through endo- and epizoochory. Initially introduced by humans, non-native plants bearing specific traits can be carried over long distances and to new environments by ungulates. These vectors can further free local resources necessary for the germination and the subsequent growth of the released diaspores. We first looked at trait-based plant community changes at different timescales in the presence of different native ungulates. We then reviewed the literature on endozoochory, regurgitation and fur-epizoochory assisted by ungulates, focusing on the dispersal of non-native plants. We made an overall assessment of ungulate-mediated non-native plant dispersal by biogeographical zone and dispersal mode, and then provided additional information on plant growth form and taxonomy, vectors and associated modes of dispersal. Results are presented for four main ungulate families: Cervidae, Bovidae, Suidae and Equidae. For each family, we highlight our findings either by ungulate if sufficiently represented (e.g. Odocoileus virginianus, Bison bison, Bos taurus) or by group of species. According to their feeding regime, grazers dispersed solely forbs and graminoids whereas omnivores also dispersed plants from other growth forms (i.e. cactus, vine, shrub and tree). Numerous non-native plants are dispersed by ungulates around the world, but this is probably the visible part of the iceberg, as only 32 ungulates (i.e. 12%) have been studied as vectors so far, suggesting their overall contribution is certainly underrated.
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Hara, Yuji, e Kazuaki Tsuchiya. "Feeding Urban Regions: Estimating the Energy Consumption of Domestic Vegetable Supplies for Osaka, Japan". In Science for Sustainable Societies, 141–50. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56445-4_12.

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Lasa, Rodrigo, Andrea Birke, Larissa Guillén, Martín Aluja e Daniel Carrillo. "Pests." In Guava: botany, production and uses, 249–69. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789247022.0013.

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Abstract This chapter focuses on major pests of guava in the different production areas of the world. The most important insects and mites have been grouped into six categories that have been divided according to different species and their importance across the different guava-producing regions. The chapter also emphasizes the basic features of each group related to their feeding damage, biology, behaviour, ecology and biorational pest management strategies. Minor pests are also listed. It is suggested that the main focus of pest control measures should be targeted towards fruit flies, some coleopteran and lepidopteran species that bore fruit and stems, and some minor pests that include scales, mealybugs, thrips, whiteflies and mites that increase guava production costs and reduce fruit quality and yields.
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Atti di convegni sul tema "Feeding regimes"

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Röcklinsberg, H., C. Berg, L. Lidfors, A. Johansson e C. E. Hernandez. "13. Feeding of colostrum – animal welfare and ethical aspect of different feeding regimes". In 13th Congress of the European Society for Agricultural and Food Ethics. The Netherlands: Wageningen Academic Publishers, 2016. http://dx.doi.org/10.3920/978-90-8686-834-6_13.

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Deisenroth, David C., Avram Bar-Cohen e Michael Ohadi. "Geometry Effects on Two-Phase Flow Regimes in a Diabatic Manifolded Microgap Channel". In ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2017 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ipack2017-74287.

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Two-phase cooling has become an increasingly attractive option for thermal management of high-heat flux electronics. Cooling channels embedded directly on the back of the heat source (chip) facilitate two-phase boiling/evaporation effectiveness, eliminating many thermal resistances generated by more traditional, remote chip-cooling approaches. Accordingly, manifold-microchannel flow paths in embedded cooling systems can allow very high heat fluxes with low junction temperatures. But, the effect of the feeding manifold design, channel geometry, and the associated shear, stagnation zones, and centripetal accelerations with varying heat flux and mass flux are not well understood. This study builds upon our previous work and elucidates effects of channel geometry, mass flux, and outlet quality on the boiling/evaporation flow regimes in a manifolded microgap channel.
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Gehannin, Je´roˆme, Mihai Arghir e Olivier Bonneau. "Complete Modeling of Squeeze Film Dampers Using the Bulk Flow Model". In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71172.

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The present work presents a bulk flow based numerical analysis of squeeze film dampers (SFD) provided with circumferential grooves, feeding orifices and piston ring sealing devices. This means that the bulk flow model for inertia dominated flow regimes (high Re) was adapted for taking into account thin film discontinuities, mass sources located in the thin film zone (for modelling feeding orifices) or on the boundaries (piston ring seals with open slots). In the present work the rotor is whirling on a centered whirl and the bulk flow equation are solved by following a time step integration.
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Xie, T., e S. M. Ghiaasiaan. "Artificial Neural Network-Based Flow Regime Classification Techniques for Gas-Liquid-Fiber Three-Phase Flows". In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56227.

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The feasibility of a transportable artificial neural network (ANN)–based technique for the classification of flow regimes in three phase gas/liquid/pulp fiber systems, using pressure signals as input, was demonstrated in this study. Both supervised and unsupervised neural network models were applied for implementing regime classification. Data obtained in a vertical column (1.8m high and 5.08cm in diameter) were used, and a supervised ANN was designed and successfully tested that used some characteristics of the power density spectrum of the recorded signals of a pressure sensor as input. The developed ANN showed encouraging transportability. An ANN-based method was also developed for adjusting the processed signals of one sensor before feeding them as input to an ANN that had been trained based on data from another similar sensor. The method further improved transportability. The objectivity of the experimentally-identified flow regimes and their transition conditions was verified by the application of a Kohonen self-organizing neural network.
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Hassini, Mohamed Amine, Mihai Arghir e Manuel Frocot. "Comparison Between Numerical and Experimental Dynamic Coefficients of a Hybrid Aerostatic Bearing". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69090.

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Hybrid journal bearings are considered since many years as a possible replacement for ball bearings in turbo-pumps used by the aerospace industry. Due to flow regimes dominated by inertia and due to the nature of the lubricant (cryogenic fluids), the prediction of the linearized dynamic coefficients in these bearings must be based on the compressible bulk-flow equations. Theoretical models based on these equations were validated for hybrid bearings working with water or for liquid or gas annular seals. Validations for hybrid compressible bearings are missing. Experimental data obtained for an air lubricated hybrid aerostatic bearing designed with shallow pockets were recently presented; the data consist of linearized dynamic coefficients obtained for rotation speeds up to 50 krpm and up to 7 bar feeding pressure. The present work introduces a consolidated numerical approach for predicting static and linearized dynamic characteristics. Theoretical predictions are based on bulk flow equations in conjunction with CFD analysis. It was found that for a given feeding pressure, the value of the pressure downstream the orifice has a major influence on all results. Special care was then taken for describing the complex flow in the feeding system and the orifice. Three dimensional CFD was employed because the bulk-flow equations are inappropriate in this part of the bearing. The pressure downstream the orifice stemming from CFD results and the feeding pressure were next imposed in the bulk flow model and the equivalent area of the orifice was obtained from the numerical solution of the steady flow in the bearing. Since the pockets of the hybrid bearing are shallow, this equivalent area is considered as being the harmonic average of the orifice cross section area and of the cylindrical curtain area located between the orifice and the rotor. The comparisons between theoretical dynamic coefficients and experimental data validated this approach of the equivalent area of the orifice.
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Rahman, Mohammad A., Ted Heidrick e Brian A. Fleck. "Predicting the Two-Phase Flow Patterns Implementing the Froude Number Correlation". In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55331.

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In this study, two-phase air/water horizontal flow characteristics with different conduit geometries were investigated. After mixing in a horizontal feeding conduit (100 cm long and 2.54 cm ID) the two-phase, air/water fluid passes through an industrial nozzle, which generates spray. Three different novel geometries were investigated in this study along with the existing design. Flow stability and different flow regimes (dispersed, intermittent and slug) for these three types of geometries were investigated. It is observed that when the input liquid content (εL) decreased to 0.5 (high ALR), the two-phase flow became unstable. It is concluded that the novel geometries are capable of producing more stable and dispersed two-phase flow pattern and spray in an industrial nozzle due to enhanced turbulent mixing.
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Boudy, Frédéric, Daniel Durox, Thierry Schuller e Sébastien Candel. "Nonlinear Flame Describing Function Analysis of Galloping Limit Cycles Featuring Chaotic States in Premixed Combustors". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68998.

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Nonlinear prediction of combustion instabilities in premixed systems is undertaken on a generic configuration featuring an adjustable feeding manifold length, a multipoint injector composed of a perforated plate and a flame confinement tube. By changing the feeding manifold or flame tube lengths, the system exhibits different types of combustion regimes for the same flow operating conditions. Velocity, pressure and heat release rate measurements are used to examine oscillations during unstable operation. For many operating conditions, a limit cycle is reached at an essentially fixed oscillation frequency and quasi-constant amplitude. In another set of cases, the system features other types of oscillations characterized by multiple frequencies, amplitude modulation and irregular bursts which can be designated by “galloping” limit cycles or GLC. These situations are explored in this article. Imaging during GLCs indicates that the flame is globally oscillating but that the cycle is irregular. Prediction of these special oscillation states is tackled within the Flame Describing Function (FDF) framework. It is shown that it is possible to predict with a reasonable degree of agreement the ranges where a quasi-constant amplitude limit cycle will be established and ranges where the oscillation will be less regular and take the form of a galloping limit cycle. It is found that the FDF analysis also provides indications on the bounding levels of the oscillation envelope in the latter case.
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Boudy, Fre´de´ric, Daniel Durox, Thierry Schuller, Grunde Jomaas e Se´bastien Candel. "Describing Function Analysis of Limit Cycles in a Multiple Flame Combustor". In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22372.

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A recently developed nonlinear Flame Describing Function (FDF) is used to analyze combustion instabilities in a system where the feeding manifold has a variable size and where the flame is confined by quartz tubes of variable length. Self-sustained combustion oscillations are observed when the geometry is changed. Regimes of oscillation are characterized at the limit cycle and also during the onset of oscillations. Theoretical predictions of the oscillation frequencies and levels are obtained using the FDF. This generalizes the concept of flame transfer function by including a dependence on the frequency and on the level of oscillation. Predictions are compared with experimental results for two different lengths of the confinement tube. These results are in turn used to predict most of the experimentally observed phenomena and in particular the correct oscillation levels and frequencies at limit cycles.
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Providakis, T., L. Zimmer, P. Scouflaire e S. Ducruix. "Characterization of the Acoustic Interactions in a Two-Staged Multi-Injection Combustor Fed With Liquid Fuel". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69658.

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Burners operating in lean premixed prevaporized (LPP) regimes are considered as good candidates to reduce pollutant emissions from gas turbines. Lean combustion regimes result in lower burnt gas temperatures and therefore a reduction on the NOx emissions, one of the main pollutant species. However, these burners usually show strong flame dynamics, making them prone to various stabilization problems (combustion instabilities, flashback, flame extinction). To face this issue, multi-injection staged combustion can be envisaged. Staging procedures enable fuel distribution control, while multipoint injections can lead to a fast and efficient mixing. A laboratory-scale staged multipoint combustor is developed in the present study, in the framework of LPP combustion, with an injection device close to the industrial one. Using a staging procedure between the primary pilot stage and the secondary multipoint one, droplet and velocity field distributions can be varied in the spray that is formed at the entrance of the combustion chamber. The resulting spray and the flame are characterized using OH-Planar Laser Induced Fluorescence, High Speed Particle Image Velocimetry and Phase Doppler Anemometry measurements. Three staging values, corresponding to three different flame stabilization processes, are analyzed, while power is kept constant. It is shown that mean values are strongly influenced by the fuel distribution and the flame position. Using adequate post-processing, the interaction between the acoustic field and the droplet behavior is characterized. Spectral analysis reveals a strong acoustic-flame coupling leading to a low frequency oscillation of both the velocity field and the spray droplet distribution. In addition, acoustic measurements in the feeding line show that a strong oscillation of the acoustic field leading to a change in fuel injection, and hence droplet behavior.
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Yun-long Kang, Xin-zhi Wang e Jun Bao. "Effects of Feeding Regime on Feeding Motivation, Behavior and Performance of Growing Pigs". In 2012 IX International Livestock Environment Symposium (ILES IX). St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2012. http://dx.doi.org/10.13031/2013.41646.

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Rapporti di organizzazioni sul tema "Feeding regimes"

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de Roo, Nina, Bas Hetterscheid, Katherine Pittore, Katrine Soma, Bertram de Rooij e Vincent Linderhof. The food systems approach applied in city regions : lessons learned from four case studies in low- and middle-income countries Kennis Basis Programme Feeding the Cities and Migration Settlements. Wageningen: Wageningen Centre for Development Innovation, 2021. http://dx.doi.org/10.18174/558894.

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Rocheford, Torbert, Yaakov Tadmor, Robert Lambert e Nurit Katzir. Molecular Marker Mapping of Genes Enhancing Tocol and Carotenoid Composition of Maize Grain. United States Department of Agriculture, dicembre 1995. http://dx.doi.org/10.32747/1995.7571352.bard.

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The overall objective of this research was to identify chromosomal regions and candidate genes associated with control of concentration and forms of carotenoids (includes pro-Vitamin A) and tocopherols (Vitamin E), which are both antioxidants and are associated with health advantages. Vitamin A and E are included in animal feeding supplements and the eventual goal is to increase levels of these compounds in maize grain so that the cost of these supplements can be reduced or eliminated. Moreover, both compounds are antioxidants that protect unsaturated fatty acids from oxidation and thus maintaining maize oil quality for longer periods. We identified three SSR markers that are associated with 38% of the variation for total carotenoids and three SSR markers associated with 44% of the variation for total tocopherols in the cross W64a x A632. We identified two candidate genes associated with levels of carotenoids: phytoene synthase and zeta carotene desaturase. Evaluation of (Illinois High Oil x B73) B73 BC 1S1 population for tocopherols detected additional chromosomal regions influencing the level of total tocopherols, and detected a common region on chromosome 5 associated with ratio of the more desirable alpha from to the gamma form of tocopherol. The results suggest molecular marker assisted selection for higher levels of these antioxidants in corn grain should be feasible.
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Preterm babies do not benefit from a new IV feeding regimen. National Institute for Health Research, luglio 2016. http://dx.doi.org/10.3310/signal-000266.

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