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Journal articles on the topic 'Merino sheep Animal nutrition'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 January 2023

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1

Santiago, L. Lomas, D. Blache, M. A. Blackberry, G. B. Martin, and A. B. Mâncio. "309. Nutrition, insulin, leptin and puberty in Merino ram lambs." Reproduction, Fertility and Development 17, no. 9 (2005): 132. http://dx.doi.org/10.1071/srb05abs309.

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Merino sheep developed in Mediterranean regions so are well adapted to acute changes in food availability. However, restricted intake during pregnancy, especially in animals that are pregnant over the dry summer, could limit the positive effects of a winter rainy season on fetal development. In this study, we tested whether the level of nutrition during pregnancy and during pre-pubertal development affected blood concentrations of insulin and leptin, scrotal circumference and age of puberty in male Merino lambs fed with pasture. During dry weather, pregnant sheep were supplemented ad libitum w

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2

Martin, Graeme B., Soedjiharti Tjondronegoro, Rachid Boukhliq, Margaret A. Blackberry, Jan R. Briegel, Dominique Blache, James A. Fisher, and Norman R. Adams. "Determinants of the annual pattern of reproduction in mature male Merino and Suffolk sheep: modification of endogenous rhythms by photoperiod." Reproduction, Fertility and Development 11, no. 6 (1999): 355. http://dx.doi.org/10.1071/rd00005.

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In mediterranean environments, pastures are very poor during the autumn and consequently small ruminants, such as sheep, would have been losing body mass for many months so, during mating, gamete production would be depressed in both sexes. Effectively, the nutritive requirements for a photo-period-driven, annual reproductive cycle are out of phase with seasonal changes in food availability. The problem could be overcome through more flexible timing of reproduction, perhaps explaining variations in seasonality between breeds that originate from differing latitudes. To study these concepts and

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Warner, R. D., D. W. Pethick, P. L. Greenwood, E. N. Ponnampalam, R. G. Banks, and D. L. Hopkins. "Unravelling the complex interactions between genetics, animal age and nutrition as they impact on tissue deposition, muscle characteristics and quality of Australian sheep meat." Australian Journal of Experimental Agriculture 47, no. 10 (2007): 1229. http://dx.doi.org/10.1071/ea07229.

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The combined effects of age and genetics and Poll Dorset sire and growth path were studied in two separate experiments (n = 595 and 627, respectively). In the first experiment, containing genotype crosses typically used in Australia (Merino, Poll Dorset, Border Leicester) and sires selected for growth or muscling, sheep were slaughtered at 4, 8, 14 and 22 months. The second experiment used Poll Dorset sires selected for high muscling, fat or growth with progeny having two levels of nutrition postweaning. Border Leicesters expressed higher levels of carcass fat percentage and intramuscular fat

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4

Kelly, RW, I. Macleod, P. Hynd, and J. Greeff. "Nutrition during fetal life alters annual wool production and quality in young Merino sheep." Australian Journal of Experimental Agriculture 36, no. 3 (1996): 259. http://dx.doi.org/10.1071/ea9960259.

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The effect of maintenance v, submaintenance diets of pregnant ewes in 1991 and 1992 on establishment of the wool follicle population in their progeny, and its effect on the progeny's wool production (quantity, quality and variation across the body of the animal) to 1.4 years of age was examined. The experimental protocol used cloned animals created by bisecting embryos at day 6 of pregnancy. Each clone was placed in a ewe, which was subsequently fed from about day 50 to 140 of pregnancy at maintenance or submaintenance. Ewes on maintenance nutrition maintained liveweight throughout pregnancy,

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5

Coppock, D. L., J. E. Ellis, and S. K. Waweru. "A comparative in vitro digestion trial using inocula of livestock from South Turkana and Kitale, Kenya." Journal of Agricultural Science 110, no. 1 (February 1988): 61–63. http://dx.doi.org/10.1017/s0021859600079697.

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SummaryThe dry-matter digestibilities of 13 important herbaceous and browse forages from an arid rangeland in north-western Kenya were evaluated in a comparative in vitro trial using rumen fluid from indigenous sheep, goats, a camel, and Merino sheep kept at an agricultural laboratory. All inoculum donors had varied diets preceding the experiment, but little substantial difference was observed in the ability of each fluid to digest test materials. Tt was concluded that the Merino sheep inoculum provided an adequate substitute for inocula from indigenous animals for studies of the nutritional e

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Paganoni, B. L., C. M. Oldham, M. B. Ferguson, A. N. Thompson, P. E. Vercoe, and D. G. Gordon. "Ewe nutrition during pregnancy and birthweight of lambs has minimal impact on fat and eye muscle depth in Merino progeny." Animal Production Science 53, no. 6 (2013): 509. http://dx.doi.org/10.1071/an12266.

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The hypothesis tested in this experiment was that Merino lambs with lower birthweights, due to poor ewe nutrition during pregnancy, would have more fat and less muscle than Merino lambs with higher birthweights. At two sites (Victoria and Western Australia) in each of 2 years, a wide range in the liveweight profiles of ewes was generated during pregnancy and lactation by varying the amount of supplements fed and feed on offer grazed. Progeny had fat and muscle depth at the C-site measured at various ages from 8 to 28 months of age. Across the four experiments, there were differences of 0.5 kg

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7

Liu, S. M., T. L. Smith, D. G. Palmer, L. J. E. Karlsson, R. B. Besier, and J. C. Greeff. "Biochemical differences in Merino sheep selected for resistance against gastro-intestinal nematodes and genetic and nutritional effects on faecal worm egg output." Animal Science 81, no. 1 (August 2005): 149–57. http://dx.doi.org/10.1079/asc50180149.

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AbstractThe faecal egg count (FEC) and total egg output is reduced in parasite-resistant sheep and breeding sheep for resistance should reduce infective larval contamination of pastures. This research compares lambs and rams from the parasite-resistant flock, Rylington Merinos, with unselected controls at the same level of larval challenge and the same level of food supply in an animal-house environment. The sheep were penned individually. The parasite resistant sheep excreted 0·85-fold less eggs than the control animals after infection with Trichostrongylus colubriformis and Ostertagia circum

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8

Searle, T. W., N. McC Graham, and J. B. Donnelly. "Change of skeletal dimensions during growth in sheep: the effect of nutrition." Journal of Agricultural Science 112, no. 3 (June 1989): 321–27. http://dx.doi.org/10.1017/s0021859600085774.

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SummaryMeasurements of skeletal size were made at 2–3-month intervals on 30 Border Leicester × Merino castrate male (wether) sheep between 2 and 27 months of age. Fifteen sheep were fed ad libitum on a high-quality diet and the other 15 half the average amount consumed by the first group, age for age. The ad libitum group grew faster and were larger in all body dimensions on each occasion, except for leg length at 27 months which showed no statistical difference between groups. When the groups were compared over the live-weight range common to both (16–44 kg) the unrationed animals were consis

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9

Mortimer, S. I., J. H. J. van der Werf, R. H. Jacob, D. W. Pethick, K. L. Pearce, R. D. Warner, G. H. Geesink, et al. "Preliminary estimates of genetic parameters for carcass and meat quality traits in Australian sheep." Animal Production Science 50, no. 12 (2010): 1135. http://dx.doi.org/10.1071/an10126.

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Using performance from progeny born in 2007 and 2008 generated by the Information Nucleus program of the Cooperative Research Centre for Sheep Industry Innovation, preliminary estimates of heritability were obtained for a range of novel carcass and meat attributes of lamb relevant to consumers, including carcass characteristics, meat quality and nutritional value of lamb. Phenotypic and genetic correlations of live animal traits with carcass composition and meat quality traits were also estimated. The data were from progeny located at eight sites, sired by 183 rams from Merino, maternal and te

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10

Kilminster, Tanya F., and Johan C. Greeff. "A note on the reproductive performance of Damara, Dorper and Merino sheep under optimum management and nutrition for Merino ewes in the eastern wheatbelt of Western Australia." Tropical Animal Health and Production 43, no. 7 (July 2, 2011): 1459–64. http://dx.doi.org/10.1007/s11250-011-9871-8.

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Martin, Graeme B., Maria J. Hötzel, Dominique Blache, Stephen W. Walkden-Brown, Margaret A. Blackberry, Rachid Boukhliq, James S. Fisher, and David W. Miller. "Determinants of the annual pattern of reproduction in mature male Merino and Suffolk sheep: modification of responses to photoperiod by an annual cycle in food supply." Reproduction, Fertility and Development 14, no. 3 (2002): 165. http://dx.doi.org/10.1071/rd02010.

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Rams of a 'Mediterranean breed' (Merino) and a 'temperate breed' (Suffolk) were compared to determine how much of the differences between their reproductive seasons is owing to variation in their responses to photoperiodic and nutritional cues. In a previous study, both nutritional and photoperiodic inputs were held constant, and it was found that the two breeds show similar endogenous rhythms and, when the animals are challenged with a Mediterranean photoperiodic cycle, these endogenous rhythms are similarly modified. The present study tested whether an annual cycle in the supply of forage mi

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Blumer, S. E., G. E. Gardner, M. B. Ferguson, and A. N. Thompson. "Environmental and genetic factors influence the liveweight of adult Merino and Border Leicester × Merino ewes across multiple sites and years." Animal Production Science 56, no. 4 (2016): 775. http://dx.doi.org/10.1071/an14419.

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Variation in liveweight change in the ewe flock during periods of poor nutrition can affect farm profitability through the effects of liveweight loss on potential stocking rate, management interventions including supplementary feeding, and ewe and lamb survival and productivity. There is variation between individual animals in their ability to manage periods of poor nutrition, but the links between liveweight change and breeding values in the adult ewe flock have not been quantified. We analysed 5216 liveweight profiles for 2772 ewes managed over 3 years at eight sites across Australia, to def

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Liu, S. M., N. R. Adams, J. B. Briegel, T. L. Smith, and G. B. Martin. "Effect of genetic resistance to gastrointestinal nematodes on plasma concentrations of insulin-like growth factor-1 and leptin in Merino sheep." Australian Journal of Experimental Agriculture 47, no. 8 (2007): 905. http://dx.doi.org/10.1071/ea06253.

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Gastrointestinal nematode infection in sheep changes the nutritional economy of the host, but little is known about the effects of infection on the hormonal systems that regulate the metabolism of the animal. This study examined two key hormones, insulin-like growth factor-1 (IGF-1) and leptin, in genetically resistant and random bred control Merino sheep in the presence or absence of nematode infection. Sixty-four 10-month-old Rylington Merino wethers, half from the parasite-resistant line and half from unselected control line, were initially maintained at two body conditions (body condition

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14

Walkom, S. F., F. D. Brien, M. L. Hebart, S. I. Mortimer, and W. S. Pitchford. "Season and reproductive status rather than genetics factors influence change in ewe weight and fat over time. 3. Analysis of Merino ewes." Animal Production Science 54, no. 6 (2014): 821. http://dx.doi.org/10.1071/an13249.

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The profitability of southern Australian sheep production systems depends on the optimisation of stocking rates by meeting the nutritional demands of the breeding ewe while effectively utilising grown pasture. The aim of the study was to evaluate the genetic variation in liveweight and body condition of Merino ewes across their breeding life within a wool-based enterprise. The results were consistent with findings in crossbred ewes and showed that the genetic component of weight and body condition remained constant across the production cycle and age. The overall additive genetic effect accoun

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Kelly, R. W., J. C. Greeff, and I. Macleod. "Lifetime changes in wool production of Merino sheep following differential feeding in fetal and early life." Australian Journal of Agricultural Research 57, no. 8 (2006): 867. http://dx.doi.org/10.1071/ar05312.

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In commercial Merino farming, a major determinant of profitability is quantity and quality of wool production. We tested the hypothesis that the level of feed restriction commonly encountered by autumn/early winter lambing Merino ewes in southern Australia was sufficient to have a detrimental effect on their progeny’s lifetime wool production. Two periods of feed restriction of the dams were tested, viz. from day 50 to 140 of gestation (Expt 1), and from day 50 of pregnancy to weaning at 12 weeks of age (Expt 2). In order to reduce the numbers of experimental animals required, identical twin l

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16

O’Neill, H. A., O. B. Einkamerer, B. T. Elago, and A. Ganswindt. "Concentrations of faecal glucocorticoid metabolites in South African Mutton Merino sheep fed various sources of roughage." South African Journal of Animal Science 50, no. 4 (October 29, 2020): 501–6. http://dx.doi.org/10.4314/sajas.v50i4.2.

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The objective of this study was to determine whether various sources of roughage in nutritionally balanced feedlot diets would evoke a stress response in sheep. A nutritional stress response test was performed on 20 ewes, randomly divided into four treatment groups with 5 ewes per group. Ewes were kept individually in metabolic crates for thirty days. Rations were balanced nutritionally, and various sources of roughage were included; T1: alfalfa hay, T2: maize stover, T3: soya hulls; and T4: Eragrostis tef. Faeces was removed manually from the caudal rectum of each ewe at 05h00 and 19h00. Samp

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Blache, Dominique, Pietro Celi, Margaret A. Blackberry, Robyn A. Dynes, and Graeme B. Martin. "Decrease in voluntary feed intake and pulsatile luteinizing hormone secretion after intracerebroventricular infusion of recombinant bovine leptin in mature male sheep." Reproduction, Fertility and Development 12, no. 8 (2000): 373. http://dx.doi.org/10.1071/rd00102.

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The aim of the present study was to determine whether leptin might play a role in the gonadotrophic response of mature merino rams to changes in the level of nutrition in rams fed ad libitum. Recombinant bovine leptin was infused intracerebroventricularly and voluntary food intake (VFI) and luteinizing hormone (LH) pulse frequency were measured. In Experiment 1, rams (n = 5) were infused for 24 h per day for 5 days with vehicle or with leptin (0.04, 0.4 and 4.0g h –1 ). All doses decreased both VFI and LH pulse frequency. In Experiment 2, rams were infused for 24 h per day for 5 days with vehi

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Hynd, PI. "Effects of nutrition on wool follicle cell kinetics in sheep differing in efficiency of wool production." Australian Journal of Agricultural Research 40, no. 2 (1989): 409. http://dx.doi.org/10.1071/ar9890409.

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Wide phenotypic variation in fibre output per follicle was generated by selecting sheep (five South Australian strongwool Merinos, one finewool Merino and one Corriedale) on this basis, and by offering these sheep a low-protein diet for 9 weeks, followed by a high-protein diet for a further 8 weeks. Clean wool production was measured over the final 3 weeks of each period, while fibre diameter, the rate of length growth of fibres and a number of follicle characters were measured over the last 7 days of each period. The rate of division of follicle bulb cells and the total volume of the germinat

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Poudel, Anit. "SMALL RUMINANTS BREEDING IN MOUNTAIN REGIONS OF NEPAL: CHALLENGES AND OPPORTUNITIES." Big Data In Agriculture 3, no. 1 (June 17, 2021): 35–40. http://dx.doi.org/10.26480/bda.01.2021.35.40.

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Small ruminants (sheep and goat) are essential components of the mixed farming system of Nepal. About 13.6 million small ruminants in the country contributing to the food, nutrition, and economic security has been integral part of the mountain ecosystem and rural economy. Despite of their large population, country is facing great trade deficit in products like meat, milk, wool and fibres. Low production is associated with impoverished productive potential of indigenous breed that are reared under abysmally managed subsistence farming. This study has tried to review the existing breeds, breedin

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Entwistle, K. W., L. J. Cummins, M. A. Hillard, J. E. Kinder, T. O'Shea, L. R. Piper, J. Thimonier, and J. F. Wilkins. "Bernard Michael Bindon — reproductive physiologist, animal scientist, research leader." Australian Journal of Experimental Agriculture 46, no. 2 (2006): i. http://dx.doi.org/10.1071/ea05222.

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This paper is a foreword to a series of papers commissioned on ‘the impact of science on the beef industry’, where the Beef CRC-related collaborative scientific work of Professor Bernard Michael Bindon will be reviewed. These papers will be presented in March 2006, as part of a ‘festschrift’ to recognise his wider contributions to the Australian livestock industries for over 40 years. Bindon’s career involved basic and applied research in many areas of reproductive physiology, genetics, immunology, nutrition, meat science and more recently genomics, in both sheep and cattle. Together with his

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Paganoni, B. L., M. B. Ferguson, S. Fierro, C. Jones, G. A. Kearney, P. R. Kenyon, C. Macleay, C. Vinoles, and A. N. Thompson. "Early reproductive losses are a major factor contributing to the poor reproductive performance of Merino ewe lambs mated at 8–10 months of age." Animal Production Science 54, no. 6 (2014): 762. http://dx.doi.org/10.1071/an13240.

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The reproductive performance of Merino ewe lambs is lower than that achieved by mature ewes and is highly variable. It is likely that embryo loss represents a major source of reproductive wastage in Merino ewe lambs, but to our knowledge no studies have attempted to determine when the major reproductive losses occur or identify predisposing factors that are likely to lead to high rates of pregnancy failures in ewe lambs. After characterising where reproductive losses occurred in Merino ewe lambs mated at 8–10 months of age, we tested the hypothesis that pregnancy failure in ewe lambs is influe

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ATES, S., G. KELES, F. INAL, A. GUNES, and B. DHEHIBI. "Performance of indigenous and exotic×indigenous sheep breeds fed different diets in spring and the efficiency of feeding system in crop–livestock farming." Journal of Agricultural Science 153, no. 3 (July 17, 2014): 554–69. http://dx.doi.org/10.1017/s0021859614000677.

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SUMMARYGenetic variation in feed efficiency may have a significant impact on sheep production in integrated crop livestock farming systems in dry areas, where the shortage and poor quality of feed is widespread. Thus, the present study was carried out to investigate the effects of sheep genotype and feed source on liveweight gain, feed conversion efficiency and dry matter (DM) intake in feedlot lambs finished on diets based on low-cost forages or a high-cost concentrated feed as a means of assessing the efficiency of this feeding system. Early weaned lambs of the purebred fat-tailed Akkaraman

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Li, L., S. M. Liu, V. H. Oddy, and J. V. Nolan. "Protein synthesis rates in skin components and skeletal muscle of sheep selected for divergent clean fleece weight in response to below- and above-maintenance nutrition." Australian Journal of Agricultural Research 58, no. 11 (2007): 1031. http://dx.doi.org/10.1071/ar06373.

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Protein metabolism in skin and muscle was studied in Merino wethers selected for high (F+, n = 10) or low (F–, n = 10) estimated breeding values for clean fleece weight, but with similar estimated breeding values for liveweight and fibre diameter, raised to 20 months of age under the same conditions, and then offered two levels of nutrition (0.8 or 1.8 × maintenance) for 37 days. Over 37 days, F+ sheep had greater rate of wool production, liveweight gain, and had greater eye-muscle and fat depth than F– sheep (P < 0.05). Fractional synthesis rates of protein (%/day) in the epidermis, dermis

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Pethick, DW, and JB Rowe. "The effect of nutrition and exercise in carcass parameters and the level of glycogen in skeletal muscle of Merino sheep." Australian Journal of Agricultural Research 47, no. 4 (1996): 525. http://dx.doi.org/10.1071/ar9960525.

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This study investigated the effects in sheep of feed intake and exercise training on (i) the level of glycogen in muscle, and (ii) carcass quality traits including growth rate, carcass weight, fat score, and the ultimate pH of muscle. Merino wethers, 12-months-old and starting body weight 38 kg, were individually penned and housed indoors. The effects of nutrition and exercise were tested for 2 levels of activity (sedentary v. exercised) and 4 levels of feed intake (1, 1.3, 1.5, 2.2 x maintenance) with 8 sheep per group housed individually. Exercise training was for 1 h at 8-9 km/h (approx. 55

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Revell, D. K., H. C. Norman, P. E. Vercoe, N. Phillips, A. Toovey, S. Bickell, E. Hulm, S. Hughes, and J. Emms. "Australian perennial shrub species add value to the feed base of grazing livestock in low- to medium-rainfall zones." Animal Production Science 53, no. 11 (2013): 1221. http://dx.doi.org/10.1071/an13238.

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Australian native perennial shrubs that are adapted to drought and infertile soils contribute nutrients to grazing systems that would otherwise support limited ruminant productivity. In this study, we report the nutritive value of 39 Australian shrub species of the genera Atriplex, Rhagodia, Maireana, Chenopodium, Enchylaena, Acacia, Eremophila, and Kennedia. Edible foliage was sampled in winter and summer, and there was little difference in nutritive value between seasons. The in vitro organic matter digestibility of most shrub species was 40–70%. Most species contained medium to high levels

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Brown, D. J., D. B. Savage, G. N. Hinch, and S. J. Semple. "Mob-based walk-over weights: similar to the average of individual static weights?" Animal Production Science 52, no. 7 (2012): 613. http://dx.doi.org/10.1071/an11306.

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Merino ewe liveweight represents an objective measure shown to have a profound effect on production outcomes and therefore research into technology that provides accurate and timely feedback of ewe liveweight change is warranted. Most sheep in Australia are not individually identified and therefore management of sheep is on a flock or ‘mob’ basis. Mob-based walk-over weighing (MBWOW) is a remote weighing concept for sheep flocks whereby animal weights are collected as they pass freely over a strategically placed weighing platform. The weights are then collected by the livestock manager, analys

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Strickland, V. J., G. L. Krebs, and W. Potts. "Pumpkin kernel and garlic as alternative treatments for the control of Haemonchus contortus in sheep." Animal Production Science 49, no. 2 (2009): 139. http://dx.doi.org/10.1071/ea07378.

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Two alternative remedies for controlling Haemonchus contortus in sheep (pumpkin kernel and garlic) were investigated. The experiment involved 18 4-month-old Merino ram lambs with six lambs per treatment group. The lambs were initially drenched to render them worm free, and then infected with 4000 L3 H. contortus larvae, 2 weeks later. Four weeks after infection, faecal egg counts were performed and lambs were allocated into treatment groups and fed their respective diets (control, pumpkin kernel or garlic) for 2 weeks. The lambs were combined into a single group grazing pasture for the last we

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Gao, Xiang, and Hucheng Wang. "Comparative Analysis of Rumen Bacterial Profiles and Functions during Adaption to Different Phenology (Regreen vs. Grassy) in Alpine Merino Sheep with Two Growing Stages on an Alpine Meadow." Fermentation 9, no. 1 (December 24, 2022): 16. http://dx.doi.org/10.3390/fermentation9010016.

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Phenological periods can affect the growth of forage, the single food source for grazing animals, and its nutrition and the stage of growth of the animals can affect the rumen microbiota. The aim of this study was to evaluate the effects of phenological periods (regreen vs. grassy) and growing stages (hoggets (1.5 years old) vs. rams (3 years old)) on rumen bacteria communities and functions in Alpine Merion sheep. The result showed that the Alpha diversity indices of ACE (p < 0.001), Chao (p < 0.001), and Shannon (p < 0.001) were higher in the regreen stage. At the phylum level, the

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Liu, S. M., G. Mata, H. O'Donoghue, and D. G. Masters. "The influence of live weight, live-weight change and diet on protein synthesis in the skin and skeletal muscle in young Merino sheep." British Journal of Nutrition 79, no. 3 (March 1998): 267–74. http://dx.doi.org/10.1079/bjn19980044.

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Wool growth is derived directly from protein synthesis in the skin of sheep, and is affected by the nutritional status of the animals. The present experiment examined both protein synthesis in the skin and muscle and wool growth in Merino lambs differing in live weight, intake and dietary protein source. The experiment was a 23 factorial design: twenty-four 5-month-old lambs initially weighing 33 kg (heavy) or 25 kg (light) were fed on a hay-based diet with either lupin seed or rapeseed meal as the major protein sources to maintain live weight (M) for 56 d, or were fed at 0.6M for 28 d (period

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Thompson, A. N., and P. I. Hynd. "Stress-strain properties of individual Merino wool fibres are minor contributors to variations in staple strength induced by genetic selection and nutritional manipulation." Animal Production Science 49, no. 8 (2009): 668. http://dx.doi.org/10.1071/ea08203.

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This paper investigates the contribution of single fibre stress-strain properties to variations in staple strength induced by both selective breeding for staple strength and nutritional manipulation. Merino weaners (n = 40), selected from ‘sound’ and ‘tender’ lines of staple strength selection flocks, were allocated to feeding regimes designed to induce liveweight changes simulating typical Mediterranean seasonal changes. Average staple strength differed by 5 N/ktex between ‘sound’ and ‘tender’ selection flocks and 18 N/ktex between extreme nutritional treatments. The force-extension propertie

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Fraser, M. D., and J. M. Moorby. "Plasma biochemical values in the guanaco (Lama guanicoe) and a comparison with the sheep." Animal Science 66, no. 1 (February 1998): 209–16. http://dx.doi.org/10.1017/s1357729800008973.

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AbstractAn initial experiment was conducted to investigate the variability of selected metabolites in the plasma from guanacos. A second experiment directly compared plasma biochemical values for guanacos with those for sheep. During the first experiment, jugular blood samples were collected from five mature castrated guanacos using an embedded experimental design. Weekly blood samples were collected at the same time (09.00 h) on the same day each week for 7 weeks. Daily blood samples were collected at the same time each day (09.00 h) during week 5. On day 2 of week 5, blood samples were colle

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McGregor, B. A., K. L. Butler, and M. B. Ferguson. "The allometric relationship between clean mohair growth and the fleece-free liveweight of Angora goats is affected by liveweight change." Animal Production Science 53, no. 2 (2013): 154. http://dx.doi.org/10.1071/an12070.

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Clean fleece weight (CFWt) is affected by liveweight and change in liveweight in Merino sheep, Angora and cashmere goats. However, how these relationships progress as animals age has not been elucidated. Measurements were made over 12 shearing periods on a population of Angora goats representing the current range and diversity of genetic origins including South African, Texan and interbred admixtures of these and Australian sources. Records of breed, sire, dam, date of birth, dam age, birthweight, birth parity, weaning weight, liveweight, fleece growth and fleece quality were taken for does an

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Strickland, V. J., J. S. Fisher, W. T. Potts, and G. W. Hepworth. "Lack of response to garlic fed at different dose rates for the control of Haemonchus contortus in Merino wether lambs." Animal Production Science 49, no. 12 (2009): 1093. http://dx.doi.org/10.1071/an09057.

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With the increased incidence of parasite resistance to chemical anthelmintics worldwide novel approaches to manage parasite infection, such as medicinal plants and their extracts, are being investigated by the scientific community. The current study tested the effect of three rates of garlic (0.9, 1.8 and 3.6%) in a pelleted ration on Haemonchus contortus in sheep. Thirty-nine Merino wether lambs aged 6 months were divided into five treatment groups, including three garlic dose rates and two control groups that received no garlic. All animals were infected with 4000 L3 H. contortus larvae 3 we

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Rowe, J. B., J. V. Nolan, G. de Chaneet, E. Teleni, and P. H. Holmes. "The effect of haemonchosis and blood loss into the abomasum on digestion in sheep." British Journal of Nutrition 59, no. 1 (January 1988): 125–39. http://dx.doi.org/10.1079/bjn19880016.

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1. An experiment was conducted to determine the effect of the abomasal parasite, Haemonchus contortus, on the pattern of digestion and nutrient utilization in Merino sheep. There were three groups of sheep: infected with H. contortus (300 larvae/kg live weight) (n 5), sham-infected by transferring blood from the jugular vein to the abomasum, and uninfected (control) sheep (n 9) which were fed daily rations equal to amounts consumed by ‘paired’ animals in the two other treatment groups. A diet containing (g/kg): lucerne (Medicago sativa) chaff 490, oat chaff 480, ground limestone 10, urea 10, a

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Allen, J. D., and J. M. Gawthornet. "Involvement of the solid phase of rumen digesta in the interaction between copper, molybdenum and sulphur in sheep." British Journal of Nutrition 58, no. 2 (September 1987): 265–76. http://dx.doi.org/10.1079/bjn19870094.

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1. Merino sheep fed on a diet of chopped wheaten hay, chopped lucerne (Medicago saliva) hay and oat grain were the source of rumen contents for the study. The diet contained (mg/kg dry weight) 3.3 copper, 0.24 molybdenum and 2.8 sulphur. The effects of adding between 5 and 25 mg Mo/kg as ammonium molybdate (AM) or tetrathiomolybdate (TTM) on the distribution and forms of Cu and Mo in rumen contents were investigated in vivo and in vitro.2. Approximately 88 % of the Cu and 94% of the Mo in rumen contents were associated with the solid phase. When AM or TTM was added to rumen contents in vivo or

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Gherardi, S. G., and J. L. Black. "Influence of post-rumen supply of nutrients on rumen digesta load and voluntary intake of a roughage by sheep." British Journal of Nutrition 62, no. 3 (November 1989): 589–99. http://dx.doi.org/10.1079/bjn19890060.

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The effect of post-rumen supply of nutrients on the rumen digesta load and voluntary consumption of roughage by Border Leicester × Merino ram lambs was investigated. A chopped wheaten hay was offered to the ram lambs (n 24), whose nutrient intake was altered by infusing into the abomasum a liquid supplement, containing reconstituted cow's milk, sodium caseinate, minerals and vitamins, for a period of at least 30 d. Either two or three lambs were allocated by live weight to each of ten rates of nutrient supplementation. The lambs were slaughtered at a target live weight of 31 kg. Voluntary inta

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Tjondronegoro, S., GB Martin, SR Sutherland, and R. Boukhliq. "Interactions between nutrition, testosterone and inhibin in the control of gonadotrophin secretion in mature rams." Reproduction, Fertility and Development 8, no. 5 (1996): 855. http://dx.doi.org/10.1071/rd9960855.

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The role of negative feedback by two testicular hormones, testosterone and inhibin, in the gonadotrophin responses of mature male sheep to changes in nutrition was tested. Six days after castration, 24 Merino rams were assigned to groups that were fed either a diet that maintained their initial liveweight (Intermediate diet), or about half of the Intermediate diet (Low diet), or the Intermediate diet with a supplement of lupin grain (High diet). One week after the change of diet, all animals were given subcutaneous testosterone implants, providing plasma testosterone concentrations of 3.06 +/-

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Carro, M. D., and M. J. Ranilla. "Influence of different concentrations of disodium fumarate on methane production and fermentation of concentrate feeds by rumen micro-organisms invitro." British Journal of Nutrition 90, no. 3 (September 2003): 617–23. http://dx.doi.org/10.1079/bjn2003935.

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Batch cultures of mixed rumen micro-organisms were used to study the effects of different concentrations of disodium fumarate on the fermentation of five concentrate feeds (maize, barley, wheat, sorghum and cassava meal). Rumen contents were collected from four Merino sheep fed lucerne hayad libitumand supplemented with 300 g concentrate/d. Disodium fumarate was added to the incubation bottles to achieve final concentrations of 0, 4, 7 and 10 mm-fumarate. In 17 h incubations, the final pH and total volatile fatty acid production increased (P<0·001) linearly for all substrates as fumarate co

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Gonzalez, R. E., D. Labuonora, and A. J. E. Russel. "The effects of ewe live weight and body condition score around mating on production from four sheep breeds in extensive grazing systems in Uruguay." Animal Science 64, no. 1 (February 1997): 139–45. http://dx.doi.org/10.1017/s1357729800015642.

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AbstractEwe live iveights were recorded 4 weeks prior to mating, at the beginning of mating and 22 to 23 days later over a period of 3 years in a flock of some 300 breeding ewes comprising approximately equal numbers of Australian Merino, Ideal (Polwarth), Merilin and Corriedale breeds in a pastorally based grazing system in Uruguay. Multiple-bearing ewes were generally heavier than single-bearing ewes which in turn were heavier than ewes which did not conceive, these differences being greatest in 3- and 4-year-old ewes (i.e. in their second and third breeding seasons). Body condition scores o

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Ryan, JP, JR Hunton, and WM Maxwell. "Increased production of sheep embryos following superovulation of Merino ewes with a combination of pregnant mare serum gonadotrophin and follicle stimulating hormone." Reproduction, Fertility and Development 3, no. 5 (1991): 551. http://dx.doi.org/10.1071/rd9910551.

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In a factorially designed experiment (N = 321), 0, 800 or 1600 I.U. pregnant mare serum gonadotrophin (PMSG) were administered in combination with 0, 12 or 18 mg follicle stimulating hormone (FSH-P) to superovulate Merino ewes in autumn and spring. A moderate dose of PMSG (800 I.U.) in conjunction with 12 or 18 mg FSH-P increased the ovulation rate above that observed when FSH-P was used alone. This was accomplished by (i) increasing the proportion of ewes that exhibited a superovulatory response (greater than 3 corpora lutea (CL) or persistent large follicles (LF): 69/70 (99%) v. 55/74 (74%),

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Morrison, M., R. M. Murray, and A. N. Boniface. "Nutrient metabolism and rumen micro-organisms in sheep fed a poor-quality tropical grass hay supplemented with sulphate." Journal of Agricultural Science 115, no. 2 (October 1990): 269–75. http://dx.doi.org/10.1017/s0021859600075237.

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SUMMARYA feeding trial was performed during 1986, in Townsville, Australia, to describe alterations in nutrient metabolism, and the coincident gross changes in rumen microbiology, when a sulphurdeficient diet was supplemented with inorganic sulphur. Eight Merino sheep were fedad libituma spear grass (Heteropogon contortus) hay of low sulphur content (0·4 g/kg DM), supplemented with all other essential minerals. Upon supplementation, daily sulphur intake was increased toc.0·75 g and four animals continued to be fedad libitum(group A) whilst the remaining animals were restricted in feed intake (

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Carro, M. D., and M. J. Ranilla. "Effect of the addition of malate onin vitrorumen fermentation of cereal grains." British Journal of Nutrition 89, no. 2 (February 2003): 181–88. http://dx.doi.org/10.1079/bjn2002759.

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Batch cultures of mixed rumen micro-organisms were used to study the effects of different concentrations of malate (Rumalato®; Norel & Nature S.A., Barcelona, Spain; composed of disodium malate–calcium malate (0·16:0·84, w/w)) on the fermentation of four cereal grains (maize, barley, wheat and sorghum). Rumen contents were collected from four Merino sheep fed lucerne hayad libitumand supplemented with 300 g concentrate/d. Rumalato® was added to the incubation bottles to achieve final concentrations of 0, 4, 7 and 10 mM-MALATE. Gas production was measured at regular intervals up to 120 h. M

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Castellaro, Giorgio, Isaí Ochoa, Consuelo Borie, and Víctor H. Parraguez. "Effects of Strategic Supplementation with Lupinus angustifolius and Avena sativa Grains on Colostrum Quality and Passive Immunological Transfer to Newborn Lambs." Animals 12, no. 22 (November 16, 2022): 3159. http://dx.doi.org/10.3390/ani12223159.

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The aim of the present study was to evaluate the effect of two types of nutritional supplementation during late gestation on the chemical composition, energy value, and IgG concentration in the colostrum and the IgG concentration in the blood serum of lambs. Pregnant Merino Precoz ewes (n = 36) carrying single fetuses were used. Animals were kept grazing on the Mediterranean annual grassland. From day ~90 of pregnancy, animals were allocated into three groups: daily supplementation with oat grain or lupine grain and a control group without supplementation. Immediately after parturition, colost

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Allingham, P. G., W. Barris, A. Reverter, V. Hilsenstein, R. van de Ven, and D. L. Hopkins. "Sire and growth-path effects on sheep meat production. 3. Fascicular structure of lamb loin muscle (m. longissimus lumborum) and the impact on eating quality." Animal Production Science 49, no. 3 (2009): 239. http://dx.doi.org/10.1071/ea08163.

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The effects of sire genetics and growth path on the fascicular structure (FS) of lamb loin muscle (m. longissimus lumborum; LL) and the consequences for eating quality were studied in progeny (n = 299) of 20 Poll Dorset sires and Merino ewes. Sires were selected on the basis of their Australian sheep breeding values (ASBV) for post-weaning growth (PWWT), loin eye muscle depth (PEMD) and subcutaneous fat (PFAT). Growth of lambs was varied by time of weaning (early or late) and by feeding level within weaning group, where lambs were either fully fed throughout or were feed restricted for 55 days

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Raeside, M. C., M. Robertson, Z. N. Nie, D. L. Partington, J. L. Jacobs, and R. Behrendt. "Dietary choice and grazing behaviour of sheep on spatially arranged pasture systems. 2. Wether lamb growth and carcass weight at slaughter." Animal Production Science 57, no. 4 (2017): 710. http://dx.doi.org/10.1071/an15540.

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Dry matter production and nutritive characteristics of the pasture feedbase during autumn are key drivers of profitability in Australia’s prime lamb systems. An experiment was conducted to test the hypothesis that offering lambs dietary choice through spatially separated combinations of perennial ryegrass (Lolium perenne L.), plantain (Plantago lanceolata L.) and/or lucerne (Medicago sativa L.) improves the post-weaning liveweight gain, condition score (CS), pre- and post-slaughter carcass characteristics and reduces the internal parasite burdens of wether lambs finished to a slaughter weight

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Khazaal, K., M. T. Dentinho, J. M. Ribeiro, and E. R. Ørskov. "A comparison of gas production during incubation with rumen contents in vitro and nylon bag degradability as predictors of the apparent digestibility in vivo and the voluntary intake of hays." Animal Science 57, no. 1 (August 1993): 105–12. http://dx.doi.org/10.1017/s0003356100006668.

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AbstractTen hays harvested at three stages (early bloom MB, mid bloom MB or in seed) made from lucerne (Medicago sativaj, sweet clover (Melilotus segetalis), Persian clover (Trifolium resupinatum) and pre-bloom (PB) Italian ryegrass (Lolium multiflorum var.), were offered ad libitum to four Merino male sheep and daily intake (g dry matter (DM) per kg M0·75) and DM apparent digestibility (DMD) were measured. In sacco DM degradation (g per 100 g DM), gas production (ml per 200 mg DM), in vitro digestibility and fibre composition (g/kg DM) of the hays were also studied. Gas production or DM degra

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Marino, Rosaria, Mariangela Caroprese, Giovanni Annicchiarico, Francesco Ciampi, Maria Ciliberti, Antonella della Malva, Antonella Santillo, Agostino Sevi, and Marzia Albenzio. "Effect of Diet Supplementation with Quinoa Seed and/or Linseed on Immune Response, Productivity and Meat Quality in Merinos Derived Lambs." Animals 8, no. 11 (November 10, 2018): 204. http://dx.doi.org/10.3390/ani8110204.

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In the last years several studies have investigated the strong relation between nutrition and immune response in the livestock production, particularly in dairy cattle and sheep. The aim of this study was to evaluate the effects of supplementation based on linseed, quinoa seeds and their combination on welfare, productivity and quality of meat from merinos derived lambs. 32 weaned lambs were divided into 4 experimental groups: quinoa (Q), linseed (LS) and combination of quinoa and linseed (LS + Q) that received the respective supplementation and control group (C) without supplementation. Lambs

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Ranilla, M. J., S. López, F. J. Giráldez, C. Valdés, and M. D. Carro. "Comparative digestibility and digesta flow kinetics in two breeds of sheep." Animal Science 66, no. 2 (April 1998): 389–96. http://dx.doi.org/10.1017/s1357729800009528.

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AbstractA study was conducted to compare apparent digestibility and digesta flow kinetics in the whole digestive tract in two breeds of sheep (Churra and Merino) offered alfalfa hay at about maintenance. Ten mature sheep (five Churra and five Merino) each fitted with a rumen cannula were used in the study. Apparent digestibility was determined by total faecal collection. Liquid (Co-EDTA) and solid (Cr-mordanted fibre) markers were used to estimate rumen volumes and digesta flows. There were no significant differences between Churra and Merino sheep either in dry-matter or fibre apparent digest

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Greeff, J. C., L. Bouwer, and J. H. Hofmeyr. "Biological efficiency of meat and wool production of seven sheep genotypes." Animal Science 61, no. 2 (October 1995): 259–64. http://dx.doi.org/10.1017/s1357729800013783.

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AbstractOne hundred and thirty-two ewes of the Merino (M), Finn × Merino (FLXM), Border Leicester × Merino (BLXM), Bleu de Maine × Merino (BMXM), Texel × Merino (TXM), Cheviot × Merino (ChXM) and Merino Landsheep × Merino (MLXM) were evaluated for efficiency of lamb production. Individual food intakes of every ewe and also of her lamb(s) were determined over a complete production cycle. Efficiency of lamb production (kg lamb marketed at 35 kg live mass per kg food consumed by the ewe and her lamb(s)) indicated that the FLXM was the most efficient, followed by the TXM, Merino, MLXM, BLXM, ChXM

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Ranilla, M. J., M. D. Carro, C. Valdés, F. J. Giráldez, and S. López. "A comparative study of ruminal activity in Churra and Merino sheep offered alfalfa hay." Animal Science 65, no. 1 (August 1997): 121–28. http://dx.doi.org/10.1017/s1357729800016374.

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AbstractA study was carried out to compare the fermentation parameters and kinetics of digestion of a range of different foods in the rumen of two breeds of sheep (Churra and Merino). Ten mature sheep (five Churra and five Merino), each fitted with a rumen cannula, were used in this study. In situ rumen degradability of both dry matter (DM) and cell wall was greater in Churra than in Merino sheep, the breed differences being significant for most of the foods used in the study (P < 0·05). These differences were greater when the foods had a higher cell wall concentration and this could be rel

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