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Добірка наукової літератури з теми "Merino sheep Nutrition"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 8 лютого 2022

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Статті в журналах з теми "Merino sheep Nutrition"

1

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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Анотація:

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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2

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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3

Lv, Xuefeng, Lei Chen, Sangang He, Chenxi Liu, Bin Han, Zhilong Liu, Mayila Yusupu, et al. "Effect of Nutritional Restriction on the Hair Follicles Development and Skin Transcriptome of Chinese Merino Sheep." Animals 10, no. 6 (June 19, 2020): 1058. http://dx.doi.org/10.3390/ani10061058.

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The high concentration of secondary branched wool follicles is a distinctive feature of the Merino sheep. At present, the molecular control of the development and branching of secondary wool follicles (SF) remains elusive. To reveal the potential genes associated with the development of hair follicles, we investigated the characteristics of prenatal and postnatal development of wool follicles, and the transcriptional expression profile in fetuses/lambs from dams under either maternal maintenance or sub-maintenance (75% maintenance) nutrition. The density of SF and the ratio of SF to primary wo

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4

Hötzel, Maria J., Stephen W. Walkden-Brown, James S. Fisher, and Graeme B. Martin. "Determinants of the annual pattern of reproduction in mature male Merino and Suffolk sheep: responses to a nutritional stimulus in the breeding and non-breeding seasons." Reproduction, Fertility and Development 15, no. 1 (2003): 1. http://dx.doi.org/10.1071/rd02024.

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This study was designed to test whether an acute improvement in diet would increase gonadotrophin secretion and testicular growth in strongly photoperiod-responsive Suffolk rams and weakly photoperiod-responsive Merino rams in both the breeding (February–March) and the non-breeding (July–August) seasons. Mature rams (n = 5 or 6) of these breeds were fed a maintenance diet (0.9 kg chaff + 100 g lupin grain) or the same diet supplemented with 1.5 kg lupin grain for 42 days in each season. Lupin grain is a rich source of both energy and protein. Testosterone, luteinizing hormone (LH) and follicle

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5

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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6

Wheeler, JL, HI Davies, DA Hedges, and PJ Reis. "Effects of nutrition and paring on linear hoof growth in sheep." Australian Journal of Agricultural Research 41, no. 1 (1990): 197. http://dx.doi.org/10.1071/ar9900197.

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Paring increased the linear hoof growth on the forefeet of Merino wethers by an average of 4.1% (P < 0.05) with a tendency for paring to promote faster growth on the medial digits. Effects of feeding these sheep with 400, 600, or 1000 g pelleted ration day-1 were assessed in a 4 X 4 Latin square design with 28-day periods using four measures of response. An extra (fifth) period was used to determine residual effects. The proportion of residual (carryover) to direct effect was much smaller for hoof growth than for wool. Hoof growth was not related to wool production. In another experiment, h

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7

van Burgel, A. J., C. M. Oldham, R. Behrendt, M. Curnow, D. J. Gordon, and A. N. Thompson. "The merit of condition score and fat score as alternatives to liveweight for managing the nutrition of ewes." Animal Production Science 51, no. 9 (2011): 834. http://dx.doi.org/10.1071/an09146.

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The liveweight profile of Merino ewes is related to the production and profitability of the sheep enterprise, but few producers measure liveweight to manage the nutrition of Merino ewes. In this paper we examine the relationship between changes in liveweight and condition score using data from the Lifetimewool project and compare condition score and fat score as alternative monitoring tools. Analyses of liveweight and condition score data from 15 flocks of Merino ewes representing a range of different genotypes and environments showed that the relationship between change in liveweight and cond

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8

Hatcher, S., J. Eppleston, R. P. Graham, J. McDonald, S. Schlunke, B. Watt, and K. J. Thornberry. "Higher weaning weight improves postweaning growth and survival in young Merino sheep." Australian Journal of Experimental Agriculture 48, no. 7 (2008): 966. http://dx.doi.org/10.1071/ea07407.

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Two monitoring projects were conducted to investigate weaner mortality in commercial Merino flocks in the Yass and the Central Tablelands Rural Lands Protection Boards located in the Southern Tablelands agricultural region of New South Wales. The projects were conducted in Yass in 2005 and in the Central Tablelands in 2006. A random sample of weaners from four flocks in the Yass board and 11 flocks in the Central Tablelands board were regularly weighed, growth rates were calculated after weaning and survival was determined by the continuing presence of an individual weaner at subsequent weighi

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9

Adams, N. R., J. R. Briegel, and A. J. M. Ritchie. "Wool and liveweight responses to nutrition by Merino sheep genetically selected for high or low staple strength." Australian Journal of Agricultural Research 48, no. 8 (1997): 1129. http://dx.doi.org/10.1071/a97025.

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The biological mechanisms underlying differences in wool staple strength were examined in 2 groups of Merino sheep that have been genetically selected for high or low staple strength, while holding fibre diameter constant. The sheep were fed below maintenance for 87 days, and then re-fed ad libitum for 63 days with a diet containing either 9% or 23% crude protein, in a cross-over design, after which they returned to the paddock until shearing. The fleeces of the 2 groups differed in staple strength (25·2 v.17·5 N/ktex, P < 0·001) but were similar in mean fibre diameter and clean fleece weig

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10

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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Більше джерел

Дисертації з теми "Merino sheep Nutrition"

1

Janse, van Rensburg Ariena. "The effect of different protein supplements on the production economics and nematode resilience of merino ewes." Pretoria : [s.n.], 2002. http://upetd.up.ac.za/thesis/available/etd-05272008-140021/.

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2

Kakar, Muhammad Azam. "Effect of peri-conceptional feed intake on early embryo development and fetal growth in the Merino ewe /." Title page, table of contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09ANP/09anpk138.pdf.

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3

Kleemann, D. O. "A study of factors affecting embryonic, fetal and lamb survival in high fecundity merino ewes." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phk638.pdf.

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Bibliography : leaves 120-133. Defines the sources of reproductive wastage in FecB FecÊ Booroola Merino x South Australian Merino ewes and examines factors associated with the survival of embryos, fetuses and lambs with the aim of improving net reproduction efficiency. Experiments were conducted to define the problem; to examine factors affecting embryonic and fetal loss; and, to investigate factors influencing wastage at lambing.

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4

Sheridan, Rouxlene. "A comparative analysis of nutrient utilisation and meat quality parameters of boer goats and South African mutton merinos." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52060.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: One of the reasons why meat supply does not meet human demand is that man has concentrated on utilising relatively few animal species as a source of meat. Development of unconventional livestock, such as goats, is advocated as a means of increasing global meat production and consumption. Although South Africa possesses large numbers of domestic ruminants, meat consumption has been limited mainly to sheep and cattle. Goats are used to a lesser extent. This is partly attributed to a general belief that goat meat is i

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5

Linsky, Anta. "Evaluation of the small ruminant nutrition system model using growth data of South African mutton merino and dorper lambs." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/41022.

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The aim of this study was to evaluate the Small Ruminant Nutrition System (SRNS) model’s performance predictions for lambs under South African conditions using growth and body composition data of early- (Dorper) and late-maturing (South African Mutton Merino), indigenous sheep breeds. The Cornell Net Carbohydrate and Protein System (CNCPS) biological model has consistently been modified to include recent information. This has led to the development of the SRNS model, but up to now the SRNS model has only been validated with European sheep breeds under European conditions. Thirty two Dor

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6

Visagie, Willem. "The digestibility and degradability of feeds and protein sources in Dohne merino sheep and boer goats." Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5303.

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Thesis (MScAgric (Animal Sciences))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The objective of this study was to evaluate Dohne Merino sheep and Boer goats in terms of the degradable parameters of a high-fibre diet, a low-fibre diet and two vegetable protein sources commonly used in South Africa. Differences between species were evaluated following the potential differences within species. The feedstuffs used were those for the following diets: low-fibre diet (LF); high-fibre diet (HF); sunflower meal (SFM) oilcake; and soybean meal (SBM) oilcake. In the first trial, the dig

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7

Bray, Megan. "Regulation of wool and body growth : nutritional and molecular approaches." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phb8267.pdf.

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"May 2002" Includes bibliographical references (leaves 148-164) Describes a series of novel experiments designed to enhance our understanding of nutrient utilisation for growth of wool and the whole body.

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8

Mateus, Bruno Miguel Gil. "Fatores que influenciam o sucesso reprodutivo em ovinos, com especial atenção à raça Merino da Beira Baixa." Master's thesis, 2020. http://hdl.handle.net/10437/11871.

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Orientação: João Cannas da Silva; co-orientação: João Diogo Pereira<br>Os fatores que influenciam a reprodução em ovinos trata-se de um tema de tamanha importância em Medicina Veterinária, que, com o passar do tempo tem sido dada mais ênfase, com o intuito de melhorar o índice reprodutivo de uma forma positiva em ovinos. Os pontos mais importantes para o sucesso reprodutivo são, o conhecimento da fisiologia reprodutiva tanto da fêmea como do macho, técnicas de sincronização de cios, saber dirigir um bom exame andrológico em machos, nutrição e também não menos importantes partos distócic

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Книги з теми "Merino sheep Nutrition"

1

Norris, R. T. Survey of post-weaning management, growth and mortality of Merino weaners. Perth: Western Australia, Department of Agriculture, 1986.

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2

Court, Jane, Sue Hides, and John Webb-Ware, eds. Sheep Farming for Meat and Wool. CSIRO Publishing, 2010. http://dx.doi.org/10.1071/9780643101333.

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Sheep Farming for Meat and Wool contains practical, up-to-date information on sheep production and management for producers throughout temperate Australia. It is based on research and extension projects conducted over many years by the Department of Primary Industries and its predecessors and the University of Melbourne.  The book covers business management, pasture growth and management, nutrition and feed management, drought management, reproductive management, disease management, genetic improvement, animal welfare and working dog health. It also gives seasonal reminders for a spring

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