Thematische Bibliographien / Australian merino sheep Physiology

Auswahl der wissenschaftlichen Literatur zum Thema „Australian merino sheep Physiology“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 29. Januar 2023

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Zeitschriftenartikel zum Thema "Australian merino sheep Physiology":

Joy, Aleena, Frank R. Dunshea, Brian J. Leury, Iain J. Clarke, Kristy DiGiacomo, Pragna Prathap, Minghao Zhang und Surinder S. Chauhan. „275 Access to Shade Mitigate Heat Stress and Improves Growth Performance in Lambs During Summer“. Journal of Animal Science 99, Supplement_3 (08.10.2021): 143–44. http://dx.doi.org/10.1093/jas/skab235.263.

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Abstract The objective of the present study was to investigate the effects of provision of shade on behavior, physiology, and growth of Merino lambs exposed to natural Australian summer conditions. Sixty Merino lambs were randomly allocated to either pasture with shade (n = 30;paddock with trees) or a pasture without shade (n = 30;paddock without any trees) for one month during southern-Australian summer (February-2021). Sheep were grazing on the pastures as per standard protocols followed on the farm with ad libitum access to water. Lambs were monitored twice daily between 0900-1000h and 1400-1600h to record their behavior, and physiological parameters were recorded on hot days (environmental temperature (T) >30°C). Behavioral patterns were represented as the proportion of animals doing specific activities in each treatment group. Grazing was the most frequent activity observed in animals during morning measurement (> 60% in both groups). However, high temperature (T > 30°C) decreased grazing behavior in sheep to < 5% in both treatments. Standing behavior was significantly greater (65.2 vs 21.6%; P < 0.05) for animals under non-shade treatment, while lying behavior was more frequent (17.3 vs 76.3%; P < 0.01) in animals having access to shade. Significantly more animals were seeking water troughs (P < 0.05) in the non-shade group (33.2%) compared to the shade group (10.3%). On an average hot day (T >28°C), most lambs in the shade group were seeking shade (P < 0.01), and when the temperature exceeded >32°C, 90% of the lambs were seeking tree shade. Sheep with access to shade exhibited lower (P < 0.01) respiration rate (117breaths/min) and rectal temperature (39.7°C) than non-shade group (151breaths/min;40.2°C). Overall, access to shade improved (P < 0.001) average daily gain (+0.047kg/day) in sheep compared to the non-shade group (-0.028kg/day). In conclusion, our research confirms that providing access to shade is an effective ameliorative strategy to mitigate heat-stress in sheep during summer heatwaves.

Entwistle, K. W., L. J. Cummins, M. A. Hillard, J. E. Kinder, T. O'Shea, L. R. Piper, J. Thimonier und J. F. Wilkins. „Bernard Michael Bindon — reproductive physiologist, animal scientist, research leader“. Australian Journal of Experimental Agriculture 46, Nr. 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 collaborators, he made large contributions to animal science by improving the knowledge of mechanisms regulating reproductive functions and in elucidating the physiology and genetics of high fecundity livestock. His collaborative studies with many colleagues of the reproductive biology and genetics of the Booroola Merino were amongst the most extensive ever conducted on domestic livestock. He was instrumental in the development of immunological techniques to control ovulation rate and in examining the application of these and other techniques to increase beef cattle reproductive output. This paper tracks his investigations and achievements both within Australia and internationally. In the later stages of his career he was the major influence in attracting a large investment in Cooperative Research Centres for the Australian cattle industry, in which he directed a multi-disciplinary approach to investigate, develop and disseminate science and technology to improve commercial cattle productivity.

Parsons, Y. M., D. W. Cooper, L. R. Piper, Y. M. Parsons und D. W. Cooper. „Genetic variation in Australian Merino sheep“. Animal Genetics 27, Nr. 4 (24.04.2009): 223–28. http://dx.doi.org/10.1111/j.1365-2052.1996.tb00482.x.

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Board, P. G. „Erythrocyte oxidized glutathione in Australian Merino sheep“. Animal Blood Groups and Biochemical Genetics 6, Nr. 2 (24.04.2009): 65–69. http://dx.doi.org/10.1111/j.1365-2052.1975.tb01353.x.

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Lakota, E. А. „PRESERVATION OF GENETIC POTENTIAL OF STAVROPOL SHEEP BREED FOR POVOLZHYE DREY STEPPE ZONE“. Vestnik of Ulyanovsk state agricultural academy, Nr. 3(50) (08.09.2020): 179–84. http://dx.doi.org/10.18286/1816-4501-2020-3-179-184.

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In conditions of Povolzhye steppe zone development of productive qualities of Stavropol breed sheep was conducted by meat merino sheep. Experimental research was carried out in ZAO «Novaya Zhizn» in Novouzensky district of Saratov region, located in semi desert zone, bordering upon South-West Khazakhstan. The research aim was the increase and maintenance of genetic potential of Stavropol breed sheep of Povolzhye population. Working procedure is based on guidelines of the All-Union Academy of Agricultural sciences, All Union research institute of sheep and goat breeding. The study materials were Stavropol pure breed sheep and 1/8 –thoroughbred cross breed with Australian meat merino herdmates. As the result of stepped breeding of local Stavropol ewe with half bred by Australian meat merino ram- breeder of Stavropol breed animals of 1/2 ,1/4, 1/8 –blood were obtained, which then one- shear tupped by breeding «inter se». It is proved that in applying such selective method 1/8-blood by Australian meat merino sheep were characterized with higher body weight, better wool quality in contrast to Stavropol pure –breed herdmates. So, in 1/8-blood by Australian meat merino of hybrid ewe during breeding «inter se» live body at birth was higher than at pure breed herdmates for 5,56 %, during ablactation –at the age of 4 months - for 6,38 % (difference isn’t accurate). According to sharing of wool in grease, superiority of ewe of hybrid origin over pure breed was 5,6 % (Р≥0,99), but in terms of washed fiber it increases to 8,3 % (Р≥0,999). So, in dry steppe zone of Povolzhye new improved, according to its productive qualities, genotype of Stavropol breed sheep is created with retention of genetic resource that is essential economic factor for the modern maintenance of fine-wool sheep breeding field.

Hatcher, S., K. D. Atkins und E. Safari. „Lamb survival in Australian Merino Sheep: A genetic analysis12“. Journal of Animal Science 88, Nr. 10 (01.10.2010): 3198–205. http://dx.doi.org/10.2527/jas.2009-2461.

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Behrendt, Karl. „Price risk exposure of Australian Merinos – is it in the bloodline?“ Animal Production Science 54, Nr. 9 (2014): 1317. http://dx.doi.org/10.1071/an14305.

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Sheep producers and their advisors utilise Australian Merino bloodline trial data to guide future sheep breeding objectives and ram selection. To adequately assess the economic outcomes from different bloodlines in the decision making process, there is a need to consider the impact of wool and sheep meat price risk. Using a steady-state wether flock model that accounts for the lifetime productivity of 268 reported Merino bloodlines and stochastic dependency in weekly wool and sheep meat prices from 28 June 2005 to 10 November 2011, gross incomes per dry sheep equivalent (GI/DSE) were calculated for a weekly time step. The analysis found that across all bloodlines and market price scenarios, GI/DSE ranged between AU$13.92 and AU$67.83, with an overall mean of AU$32.60. The individual means of bloodlines across the time series ranged from AU$37.46 to AU$25.19 GI/DSE. The coefficient of variation, used as the measure of relative risk for each bloodline, ranged from 0.24 to 0.30 with a mean of 0.25. The analysis showed that a bloodlines exposure to price risk has a curvilinear relationship to fibre diameter and fleece weight. The results from a risk-reward point of view indicate that the majority of Australian Merino bloodlines are risk-inefficient. This suggests Australian sheep producers have a significant opportunity to increase net returns and reduce price risk exposure by identifying and switching to more risk-efficient bloodlines.

Brown, D. J., und N. M. Fogarty. „Genetic relationships between internal parasite resistance and production traits in Merino sheep“. Animal Production Science 57, Nr. 2 (2017): 209. http://dx.doi.org/10.1071/an15469.

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Breeding Merino sheep that are resistant to internal parasites alleviates the high costs associated with treatment of worm infestation and loss of production, as well as mitigating the development of anthelmintic resistance among the major worm species. Faecal worm egg count ((cube root transformation), wec) can be used in sheep as a measure of internal parasite resistance. Accurate estimates of genetic parameters for wec are required for calculation of Australian Sheep Breeding Values and inclusion of worm resistance in sheep breeding programs. This study provides updated estimates of heritability for wec and its genetic correlations with production traits. Data were analysed from a wide range of Australian and New Zealand Merino sheep in the MERINOSELECT database, which included 141 flocks with 801 flock years and up to 217 137 animals with wec recorded in at least one of four ages (W = weaning, P = post weaning, Y = yearling, H = hogget). The heritability estimates ranged from 0.16 ± 0.01 for Ywec to 0.29 ± 0.01 for Wwec, with generally high genetic correlations between the ages. Bivariate analyses estimated genetic correlations between wec at the various ages and growth, carcass quality, reproduction and wool production traits at various ages. These genetic correlations were generally small or close to zero, albeit with some significantly different from zero. The moderate heritability for wec (0.2–0.3) and its high phenotypic variation (coefficient of variation >30%) shows that relatively rapid selection response for worm resistance could be achieved. Inclusion of wec in sheep breeding programs to increase worm resistance would be expected to have little if any impact on other important production traits. These genetic parameters have been incorporated into MERINOSELECT by Sheep Genetics to provide Australian Sheep Breeding Values for wec and appropriate indices for wool and meat production. There is evidence that genotype × environment interactions may be important in some environments by reducing the accuracy of Australian Sheep Breeding Values for wec. Hence it may be prudent for breeders to implement strategies that manage the risk of any impact of genotype × environment on their breeding program.

Parsons, Y. M., M. R. Fleet und D. W. Cooper. „The Agouti gene: a positional candidate for recessive self-colour pigmentation in Australian Merino sheep“. Australian Journal of Agricultural Research 50, Nr. 6 (1999): 1099. http://dx.doi.org/10.1071/ar98099.

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The occurrence of self-colour pigmentation in the Australian Merino wool flock is of considerable economic importance. The Agouti gene is believed to be responsible for the recessive expression of pigmented fleece. Using comparative mapping information we have investigated the putative homologous ovine map positon of the Agouti gene for linkage to the recessive self-colour phenotype of Australian Merino sheep. Significant results were observed with microsatellites previously mapped to ovine chromosome 13. Comparative data suggest that the ovine Agouti gene would map to the same chromosome, making the Agouti gene a positional candidate for the self-colour phenotype.

Fortune, J. A. „Reproductive physiology of Merino sheep: Concepts and consequences“. Animal Reproduction Science 30, Nr. 4 (Januar 1993): 335–36. http://dx.doi.org/10.1016/0378-4320(93)90083-4.

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Dissertationen zum Thema "Australian merino sheep Physiology":

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.

Auclair, Dyane. „Pubertal development in the merino ram lambs and immunization against oestrogens“. Title page, contents and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09pha898.pdf.

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Bibliography: leaves 281-316. Presents investigations on pubertal development in South Australian merino ram lambs and examines the effect of active and passive immunizations against oestradiol-17ℓ or oestrone on testicular maturation.

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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Paganoni, Beth Louise. „Increasing feed-on-offer to merino ewes during pregnancy and lactation can increase muscle and decrease fat, but does not affect the faecal worm egg count of their progeny“. University of Western Australia, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0129.

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Ewes at two sites were fed to be either condition score 2 or 3 by Day 90 of pregnancy and then grazed on various levels of feed-on-offer (FOO) from Day 90 of pregnancy until weaning, to investigate whether nutrition of Merino ewes during pregnancy and lactation affected the muscle, fat and immunity to worms of their progeny. Eye muscle and fat depth at the C-site, and faecal worm egg counts (FWECs) of the progeny were measured between 7 - 27 months of age. Ewe condition score at day 90 of pregnancy did not impact largely on the eye muscle depth, fat depth or FWEC of the progeny. Increasing FOO available to ewes during the last 60 days of pregnancy and throughout lactation increased the eye muscle depth of progeny at one site and decreased the fat depth of progeny at the other site (P<0.05), but did not affect the majority of FWECs of the progeny at either site. The FWECs of the progeny were low, indicating a relatively low larval challenge, which limits the likelihood of differences in immunity to worms between the progeny being expressed. This Masters demonstrated that levels of nutrition available to Merino ewes typical of commercial grazing conditions had only small effects on the eye muscle and fat depth at the C-site, and on the faecal worm egg counts of their progeny

Campbell, Angus John Dugald. „The effect of time of shearing on wool production and management of a spring-lambing merino flock /“. Connect to thesis, 2006. http://eprints.unimelb.edu.au/archive/00003254.

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Young, Douglas Arthur. „Restrictions on the trade of biological resources : the case of Australian merino genes /“. Title page, contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09ECM/09ecmy69.pdf.

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Finn, B. P. „The anatomy and biomechanics of the masticatory apparatus in the Australian merino sheep /“. Title page, contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09DM/09dmf514.pdf.

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Tahmasebi-Sarvestani, Abdolghafar. „Innervation of the temporomandibular joint : an experimental animal model using Australian merino sheep /“. Title page, abstract and contents only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09pht1284.pdf.

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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.

Supreme, Jez. „Determination of the genetic cause of an internationally unique, naturally occurring muscular dystrophy in Western Australian Merino sheep“. Thesis, Supreme, Jez (2013) Determination of the genetic cause of an internationally unique, naturally occurring muscular dystrophy in Western Australian Merino sheep. Honours thesis, Murdoch University, 2013. https://researchrepository.murdoch.edu.au/id/eprint/20751/.

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Muscular dystrophies (MDs) are neuromuscular disorders characterised by chronic, usually progressive, skeletal muscle weakness. Individuals often lose walking ability and can suffer terminal cardiorespiratory complications. Determining the genetics of a disease helps provide diagnosis, prognosis, genetic counselling, and the basis for rational therapeutic design. A naturally occurring sheep model of autosomal recessive congenital MD was identified in WA in the 1950’s and preserved as a research colony. The pathological features and distribution of this MD is novel. A sheep model of MD is incredibly valuable; sheep have similar skeletal muscle mass to humans, representing a significant improvement over smaller mammals in which to trial therapies. Successfully characterising the causative gene(s) would enable a possible target for new therapies and may open new lines of investigation into better understanding and treatment of MD in humans. This project utilised a two-pronged approach to investigate the genetics of this ovine MD. First, bioinformatics analysis of SNP genotyping for multiple individuals in the flock by a 50,000 SNP array in combination with the latest sheep genome reference build released by the International Sheep Genome Consortium, enabling homozygosity mapping, genetic linkage and association mapping. Second, molecular biological approaches further explored the identified prime candidate gene by cDNA sequencing. This research project identified ROCK2 as the prime candidate gene most likely harbouring a mutation causing the muscular dystrophy in this internationally unique ovine model. It also demonstrated for the first time in sheep the existence of ROCK2m, an isoform of ROCK2 preferentially expressed in skeletal muscle. This work has set the stage for further investigations into ROCK2m and the ovine MD which will hopefully pinpoint the causative disease mutation.

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Bücher zum Thema "Australian merino sheep Physiology":

Lee, Timothy. Wanganella and the merino aristocrats. Richmond, Vic: Hardie Grant Books, 2011.

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Hewat, Tim. Golden fleeces II: The Murdoch years at Boonoke. Sydney: Bay Books, 1987.

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Garran, J. C. Merinos, myths and Macarthurs: Australian graziers and their sheep, 1788-1900. Rushcutters Bay, N.S.W: Australian National University Press, 1985.

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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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Snowden, John M. Alternative sharpening agents and the influence of animal age on the properties of Merino leather: Investigation of alternative sharpening agents. [Perth, W.A.]: Dept. of Agriculture, Western Australia, 1994.

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Arnaboldi, Helen. Another era: The life story of Jim Mitchell, a merino sheep pioneer, 1897-1992. Rockhampton, Qld: Central Queensland University Press, 2006.

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C, M. MARTIN G. B. and PURVIS I. W. eds OLDHAM. Reproductive Physiology of Merino Sheep: Concepts and Consequences. University of Western Australia, 1990.

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W, Morley Frederick H., University of Sydney. Post-Graduate Committee in Veterinary Science. und University of Sydney. Post-Graduate Foundation in Veterinary Science., Hrsg. Merinos, money & management. Sydney South NSW, Australia: Post Graduate Committee in Veterinary Science, University of Sydney, 1994.

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Buchteile zum Thema "Australian merino sheep Physiology":

Narayan, Edward, Gregory Sawyer, Natalie Hoskins und Greg Curren. „Reproductive Rates of Merino Ewes and Offspring Quality under AI Program“. In Sheep Farming [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99617.

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Reproductive wastage is a major economic burden in sheep production globally, especially within Australia as livestock production systems face increased pressure from climatic variability (e.g. prolonged droughts or flooding). Sheep are sensitive to acute changes in their environment such as heat stress, which if not adequately monitored will result in significant production losses such as reproductive failure, increased parasite and worm burden, morbidity and mortality risks. Through basic and applied research in the areas of stress and reproductive physiology our team has made significant advancements in the understanding of sheep behaviour and physiological responses to acute and chronic stressors. Using minimally invasive hormone monitoring technology in combination with field based assessment of sheep health and productivity traits, our team has delivered new knowledge on how sheep react to acute environmental stress and how it impacts on sheep reproduction. In this chapter, we evaluated the fertility rates and embryo quality of Merino ewes under AI breeding program. We discuss factors such as heat stress that can impact on ewe and offspring quality.

„australian merino sheep“. In The Fairchild Books Dictionary of Textiles. Fairchild Books, 2021. http://dx.doi.org/10.5040/9781501365072.817.

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Beinart, William, und Lotte Hughes. „Sheep, Pastures, and Demography in Australia“. In Environment and Empire. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780199260317.003.0011.

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Succeeding phases of British economic growth prompted strikingly different imperatives for expansion, for natural resource exploitation, and for the social organization of extra-European production. In the eighteenth century, sugar, African slaves, and shipping in the Atlantic world provided one major dynamic of empire. But in the nineteenth century, antipodean settlement and trade, especially that resulting from expanding settler pastoral frontiers, was responsible for some of the most dramatic social and environmental transformations. Plantations occupied relatively little space in the new social geography of world production. By contrast, commercial pastoralism, which took root most energetically in the temperate and semi-arid regions of the newly conquered world, was land-hungry but relatively light in its demands for labour. The Spanish Empire based in Mexico can be considered a forerunner. By the 1580s, within fifty years of their introduction, there were an estimated 4.5 million merino sheep in the Mexican highlands. The livestock economy, incorporating cattle as well as sheep, spread northwards through Mexico to what became California by the eighteenth century. Settler intrusions followed in the vast landmasses of southern Latin America, southern Africa, Australia, and New Zealand. Australia was one of the last-invaded of these territories, and, in respect of the issues that we are exploring, was in some senses distinctive. Unlike Canada and South Africa, there was no long, slow period of trade and interaction with the indigenous population; like the Caribbean, the Aboriginal people were quickly displaced by disease and conquest. The relative scale of the pastoral economy was greater than in any other British colony. Supply of meat and dairy products to rapidly growing ports and urban centres was one priority for livestock farmers. Cattle ranching remained a major feature of livestock production in Australia. Bullock-carts, not dissimilar to South African ox-wagons, were essential for Australian transport up to the 1870s. But for well over a century, from the 1820s to the 1950s and beyond, sheep flooded the southern lands. Although mutton became a significant export from New Zealand and South America, wool was probably the major product of these pastoral hinterlands—and a key focus of production in Australia and South Africa. The growth in antipodean sheep numbers was staggering.