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Thematische Bibliographien / Merino sheep Development / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „Merino sheep Development“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 28. Januar 2023

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1

Ruoss, Chantelle, Amanda Tadros, Tim O'Shea, Jim McFarlane, and Ghanim Almahbobi. "Ovarian follicle development in Booroola sheep exhibiting impaired bone morphogenetic protein signalling pathway." REPRODUCTION 138, no. 4 (October 2009): 689–96. http://dx.doi.org/10.1530/rep-09-0190.

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The role of bone morphogenetic proteins (BMPs) in the regulation of ovarian function has been extensively investigated but the mechanism of regulation is not well understood. The aim of this study was to investigate the effect of mutation in the BMP receptor in Booroola sheep on the number of primordial follicles and rate of follicle recruitment in comparison with that in normal merino sheep in vivo. Whole sheep ovaries at the time of birth, 1.5 and 5 years old were collected and processed for the follicle quantification, using computerised stereological methods and statistical analyses. At bi

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Torekhanov, A. A., and N. K. Zhumadillayev. "ETTI MERINOS – KAZAKHSTANI EXPORT-ORIENTED MEAT BREAD." REPORTS 335, no. 1 (February 12, 2021): 146–51. http://dx.doi.org/10.32014/2021.2518-1483.21.

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Sheep breeding in Kazakhstan is a traditional branch of animal husbandry. The development of the industry is facilitated by the presence of large areas of pasture lands, as well as the existing valuable gene pool of breed resources, created by national selection and long-term work of scientists-breeders. The republic has great potential for the further development of sheep breeding industry and is able not only to meet the population's need for mutton, but also to become a major exporter. The restoration and further development of domestic sheep breeding should be based on rational use of gene

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Bell, Stephen. "Aimé Bonpland and Merinomania in Southern South America." Americas 51, no. 3 (January 1995): 301–23. http://dx.doi.org/10.2307/1008225.

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As an integrating theme in the biological or ecological expansion of Europe, merino sheep were so important that one authority on their dispersal sees the nineteenth century standing as “the century of the Merino.” Merinos produce a wool of distinctive quality, one long appreciated for providing warmth without excessive weight. Guarded for centuries by Spanish monopoly, the breed's status as something of a prize outside Spain began to change in 1808 with the Napoleonic invasion of the Iberian peninsula. By around 1820, a major new phase in merino dispersal was underway with its adaptation to s

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Szabó, Mária, Szilvia Kusza, István Csízi, and István Monori. "The status of the Hungarian Merino sheep breed compared to the other merino breeds." Acta Agraria Debreceniensis, no. 69 (March 23, 2016): 151–56. http://dx.doi.org/10.34101/actaagrar/69/1804.

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Merino and Merino-derived sheep breeds have been widely known and distributed across the world, both as purebred and admixed populations. They represent a diverse genetic resource which over time has been used as the basis for the development of new breeds. In spite of this, their gene-pool potential is still unexplored. The Merino sheep represent the most important sheep resource of the Hungarian husbandry. It has the largest amount of individuals between both of the stock and commercial flocks. But in Europe the Merino stocks went through a drastic reduction in number. Thus these breeds beca

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Wilkes, M. J., P. I. Hynd, and W. S. Pitchford. "Damara sheep have higher digestible energy intake than Merino sheep when fed low-quality or high-quality feed." Animal Production Science 52, no. 1 (2012): 30. http://dx.doi.org/10.1071/an11033.

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The use of animals that are resilient to challenging environments is becoming of increasing importance in animal production systems. Interest in breeds of sheep such as the Damara for sheep meat production is increasing in Australia. Anecdotally this breed outperforms the traditionally grazed Merino in the harsh rangeland environments encountered in the Pastoral Zone of Australia, but little evidence is available to support this claim. A trial was conducted to quantify differences in the efficiency of feed utilisation and growth performance of Damara and Merino sheep under two contrasting diet

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Edwards, J. E. Hocking, M. J. Birtles, P. M. Harris, A. L. Parry, E. Paterson, G. A. Wickham, and S. N. McCutcheon. "Pre- and post-natal wool follicle development and density in sheep of five genotypes." Journal of Agricultural Science 126, no. 3 (May 1996): 363–70. http://dx.doi.org/10.1017/s002185960007492x.

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SUMMARYThe pre-natal and post-natal development of wool follicles in sheep of five genotypes with contrasting wool types was examined to provide data on which to base studies of physiological factors affecting wool type via follicle development. This study was conducted following Autumn mating in 1992 at Palmerston North, New Zealand (40° S, 176° E). The rate and timing of follicle development in midside skin samples from Romney, Merino, Merino × Romney (M × R), Drysdale and Wiltshire foetuses and lambs collected at weekly intervals from days 76 to 143 of gestation and 1, 3, 7, 12 and 32 weeks

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Khasanah, Himmatul, Gayuh Syaikhullah, and Muhammad Adhyatma. "The Carcass and Nutritional Meat Characteristics of Sapudi and Cross Merino Sheep." Buletin Peternakan 46, no. 3 (August 31, 2022): 184. http://dx.doi.org/10.21059/buletinpeternak.v46i3.74048.

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Sheep meat plays an important role in accomplishing balanced and healthy nutrition as a source of protein, fat, and essential micronutrients such as zinc, iron, and vitamin B12. The amino and fatty acid composition of meat in different breeds need to be assessed to characterize and determine the development prospects of sheep that produce healthy and good quality meat. Therefore, this study aimed to investigate the phenotypic characteristics of the Sapudi and Cross Merino meat sheep including the carcass performance and meat qualities. We reared four Sapudi and four Cross Merino ewes in the sa

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MUSALAYEV, KH KH, R. A. ABDULLABEKOV, and P. M. MAGOMEDOVA. "MERINO SHEEP BREED RAISED UNDER MOUNTAIN BREEDING SYSTEM." Izvestiâ Timirâzevskoj selʹskohozâjstvennoj akademii, no. 3 (2020): 81–93. http://dx.doi.org/10.26897/0021-342x-2020-3-81-93.

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Dagestan is the leading Republic of Russia in terms of the number of sheep and sheep breeding products. The zoned target sheep breed in Dagestan is the Dagestan mountain breed. However, this breed produces thin but non-merino wool. Developing the Merino sheep breed suitable for mountain breeding is an urgent problem. The new Merino sheep breed was developed for the foothill zone of Dagestan, where summer Alpine and winter low-lying pastures are located at a distance of no more than 150 km from each other, and summer Alpine pastures are located at an altitude of up to 3000 meters above sea leve

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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, no. 3(50) (September 8, 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 wer

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Forrest, JW, and MR Fleet. "Pigmented Spots in the WoolBearing Skin of White Merino Sheep Induced by Ultraviolet Light." Australian Journal of Biological Sciences 39, no. 2 (1986): 125. http://dx.doi.org/10.1071/bi9860125.

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Black-grey pigmented skin spots, some of which contained pigmented wool fibres, were observed in a flock of 8� 5-year-old white Merino ewes. The spots were concentrated along the backline and increased in number following shearing, suggesting exposure to sunlight to be of importance in the development of these non-congenital pigmented skin spots in genetically white Merino sheep. To test the effect of ultraviolet light, white Merino sheep, ranging in age from 3 to 8 years, had a closely clipped mid side area of wool-bearing skin irradiated on each of 28 consecutive days. Pigmented skin spots d

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Ponnampalam, E. N., D. L. Hopkins, K. L. Butler, F. R. Dunshea, and R. D. Warner. "Genotype and age effects on sheep meat production. 2. Carcass quality traits." Australian Journal of Experimental Agriculture 47, no. 10 (2007): 1147. http://dx.doi.org/10.1071/ea07001.

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The present study examines carcass quality traits in different genotypes of Australian sheep slaughtered at 4, 8, 14 and 22 months of age. Poll Dorsetgrowth × Border Leicester Merino (PDg × BLM), Poll Dorsetgrowth × Merino (PDg × M), Poll Dorsetmuscling × Merino (PDm × M), Merino × Merino (M × M) and Border Leicester × Merino (BL × M) genotypes were compared. Sires were selected on the basis of growth (PDg, M and BL) and muscle (PDm) using estimated breeding values (EBVs). Approximately 150 mixed sex animals were slaughtered at each age (595 in total for the four slaughters) and carcass qualit

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Tuncer, Selçuk Seçkin, Sedat Behrem, Yunus Arzık, and Mehmet Kızılaslan. "Some Morphologic Characteristics of Central Anatolian Merino Sheep." Turkish Journal of Agriculture - Food Science and Technology 10, no. 12 (December 20, 2022): 2410–14. http://dx.doi.org/10.24925/turjaf.v10i12.2410-2414.5293.

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This study aimed to investigate the body weight and some body measurements in Central Anatolian Merino sheep regarding ages and to carry out a comparative analysis between them. The study included a total of 60 animals aged 2, 3 and 4 years. The sheep were fed daily with hay, vetch, alfalfa and limited amount of concentrated feed (400 g head-1) until the pasture period, and pasture grass and mixed grass-clover hay during the pasture period. The live weights of the sheep of different ages in the farms were measured with a digital scale, and some body size were measured using a measuring tape an

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Dimitrova, Ivona, Milena Bozhilova-Sakova, Margarit Iliev, and Atanaska Teneva. "Genetic variation of CAST gene in Local Karnobat and Karnobat merino sheep breeds." BIO Web of Conferences 42 (2022): 01029. http://dx.doi.org/10.1051/bioconf/20224201029.

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Karnobat sheep plays an important role in the development of sheep breeding in Southeastern region of Bulgaria. They are valuable source of genetic material. The aim of present experiment was to determine the allele variation of CAST gene in Local Karnobat and Karnobat Merino sheep breeds. A total of 60 blood samples were collected – 30 per breed. DNA was extracted and genotypes of all animals were identified by means of PCR-RFLP technique. The restriction reactions were accomplished by specific enzyme MspI. As expected both breeds were characterized with low level of genetic diversity due to

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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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Norris, B. J., N. I. Bower, W. J. M. Smith, G. R. Cam, and A. Reverter. "Gene expression profiling of ovine skin and wool follicle development using a combined ovine - bovine skin cDNA microarray." Australian Journal of Experimental Agriculture 45, no. 8 (2005): 867. http://dx.doi.org/10.1071/ea05050.

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Low fibre diameter and high fleece weight are important determinants of the economic value of the Merino fleece. The combination of these traits is found in Merino sheep with high follicle densities resulting from a high secondary to primary follicle ratio. Morphological stages in the development of primary and secondary follicles of fetal sheep skin have been well described. We have used gene expression profiling of fetal skin to identify genes that may be important in controlling these follicle developmental processes. A combined ovine (2.3 K) and bovine (6.14 K) cDNA microarray of 2 fetal a

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Z, Hernández-Russo. "Effect of Gastrointestinal Nematodes on Reproduction and Lamb Growth in Australian Merino Sheep." Open Access Journal of Veterinary Science & Research 5, no. 2 (2020): 1–5. http://dx.doi.org/10.23880/oajvsr-16000204.

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Environmental conditions in Uruguay favour the development of gastrointestinal nematodes (GIN) throughout the year, with clinical or subclinical manifestations that cause significant economic losses. The aim of this study was to evaluate the effect of the GIN on fertility, fecundity, reproductive rate and lamb growth in Australian Merino sheep grazing on basalt fields. The study was carried out in a farm located in north of Uruguay. Sixty-eight Merino ewes facing a natural parasite challenge were divided into two groups. Control group was doused with active anthelmintic that have proven effica

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Raadsma, HW, AR Gilmour, and WJ Paxton. "Fleece rot and body strike in Merino sheep. I. Evaluation of liability to fleece rot and body strike under experimental conditions." Australian Journal of Agricultural Research 39, no. 5 (1988): 917. http://dx.doi.org/10.1071/ar9880917.

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The conceptual model that variation in resistance of Merino sheep to fleece rot and body strike could be attributed to an underlying variable with a continuous normal distribution, termed 'liability', was examined in four experiments. A total of 640 young Merino sheep were exposed from 0 to 13 days to a simulated rainfall treatment to allow the development of fleece rot. The incidence of fleece rot ranged from 0% of sheep affected in unwetted control groups and increased up to 100% affected with increased exposure to wetting. Assuming binomial variation, the response in fleece rot and flystrik

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Krivoruchko, A., and O. Yacyk. "New parameters of lifetime assessment of meat productivity of Dzhalginskiy merino sheep." Agrarian Bulletin of the 207, no. 04 (June 6, 2021): 74–84. http://dx.doi.org/10.32417/1997-4868-2021-207-04-74-84.

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Abstract. For breeding work in order to increase productivity indicators in sheep, it is necessary to use the most informative exterior parameters. This dictates the need to develop new approaches to assessing phenotypic parameters. Purpose. Development of new parameters for live assessment of meat productivity of sheep of the Dzhalginskiy merino breed and study of their significance using the method of principal components. Scientific novelty. We have proposed several new parameters for the lifetime assessment of the parameters of meat productivity and studied the possibility of their use in

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McDowall, M. L., N. S. Watson-Haigh, N. M. Edwards, H. N. Kadarmideen, G. S. Nattrass, H. A. McGrice, and P. I. Hynd. "Transient treatment of pregnant Merino ewes with modulators of cortisol biosynthesis coinciding with primary wool follicle initiation alters lifetime wool growth." Animal Production Science 53, no. 10 (2013): 1101. http://dx.doi.org/10.1071/an12193.

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The economically important characteristics of the adult fleece of Merino sheep, such as increases in clean fleece weight, fibre length, fibre diameter and crimp characteristics are determined during critical phases of fetal development of the skin and its appendages. Genetics plays a major role in the development of traits, but the maternal uterine environment could also influence development. Treatment of pregnant ewes with cortisol and its analogues has previously been shown to produce changes in wool follicle morphology. The aim of this study was to determine the effect of transient manipul

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Brown, D. J., and N. M. Fogarty. "Genetic relationships between internal parasite resistance and production traits in Merino sheep." Animal Production Science 57, no. 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 heritab

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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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Chao, Tianle, Zhibin Ji, Lei Hou, Jin Wang, Chunlan Zhang, Guizhi Wang, and Jianmin Wang. "Sheep skeletal muscle transcriptome analysis reveals muscle growth regulatory lncRNAs." PeerJ 6 (April 11, 2018): e4619. http://dx.doi.org/10.7717/peerj.4619.

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As widely distributed domestic animals, sheep are an important species and the source of mutton. In this study, we aimed to evaluate the regulatory lncRNAs associated with muscle growth and development between high production mutton sheep (Dorper sheep and Qianhua Mutton Merino sheep) and low production mutton sheep (Small-tailed Han sheep). In total, 39 lncRNAs were found to be differentially expressed. Using co-expression analysis and functional annotation, 1,206 co-expression interactions were found between 32 lncRNAs and 369 genes, and 29 of these lncRNAs were found to be associated with m

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Fleet, M. R. "Development of black pigmented skin spots and pigmented wool fibres in a Merino flock—causes, field observations, and wool measurement." Australian Journal of Agricultural Research 57, no. 7 (2006): 751. http://dx.doi.org/10.1071/ar05032.

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The development of black-grey pigmented skin spots and pigmented wool fibres on adult Merino sheep over a 3-year period was assessed. Effects of long-term grazing of oestrogenic pasture and multiple shearing were studied. The number of affected sheep and number of pigmented spots on affected sheep increased with age, with the greatest increase at 8.5 years age. Grazing of oestrogenic pastures had no effect but twice yearly shearing increased the development of pigmented spots after 2 years of treatment. Measurements on fleeces and top from sheep with no apparent pigmented spots showed that thi

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Murray, JD, CD Nancarrow, RJ Scaramuzzi, and Y. Cognie. "Polyploid Abnormalities in Day 3 and Day 5 Merino Sheep Embryos." Australian Journal of Biological Sciences 41, no. 2 (1988): 157. http://dx.doi.org/10.1071/bi9880157.

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The chromosome complement was assessed in Merino sheep embryos collected at 3 and 5 days after the onset of oestrus. Donor ewe treatments were: untreated, or immunized against androstenedione (day 3); and untreated, or treated with follicle-stimulating hormone (FSH), or treated with FSH plus immunization against androstenedione (day 5). No significant differences in the frequency of chromosomally abnormal embryos between treatment groups within each age group were observed, so the data have been combined. Euploid abnormalities were observed in 10�8070 of the day-3 embryos (4/37), with the abno

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Moore, GPM, N. Jackson, K. Isaacs, and G. Brown. "Development and density of wool follicles in Merino sheep selected for single fibre characteristics." Australian Journal of Agricultural Research 47, no. 8 (1996): 1195. http://dx.doi.org/10.1071/ar9961195.

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Wool follicles are classified into 3 major types: primary (P), original secondary (SO), and derived secondary (SD). They are formed during fetal life as successive waves of initiation pass through the skin. P follicles are the first to be initiated. SO follicles develop between the primaries and are separated from them at non-randomly distributed sites. SD follicles are the last to be initiated and branch from SO and other SD follicles. We have measured the densities of these follicles in 4 lines of sheep selected for different fleece characters. Primary follicle and total follicle densities (

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Franco, Antonio, Javier Masot, and Eloy Redondo. "Comparative analysis of the merino sheep and Iberian red deer abomasum during prenatal development." Animal Science Journal 88, no. 10 (April 19, 2017): 1575–87. http://dx.doi.org/10.1111/asj.12783.

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Morcombe, PW, KP Croker, and JG Allen. "Liver damage and the liveweight changes in Merino wether weaners grazing mixed crops of oats and sweet narrow-leafed lupins." Australian Journal of Experimental Agriculture 27, no. 1 (1987): 19. http://dx.doi.org/10.1071/ea9870019.

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Merino wether weaners were grazed on mixed crops of oats and sweet lupins at 3 stocking rates (15, 30 and 60 sheep/ha), pure lupins (60 sheep/ha) or pastures (7.5 sheep/ha) with and without an ad libitum ration of an oat-lupin grain mix in 2 experiments. Changes in liveweights and liver damage due to lupinosis were measured. In experiment 1, when grazing commenced in late January 1982, the weaners grazed on the mixed crops at 15, 30 and 60 sheep/ha gained 4.8 kg over 91 days, 2.9 kg over 43 days and 1.2 kg over 43 days, respectively, while those on the pure lupins gained 0.7 kg over 14 days. T

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Tatara, MR, A. Brodzki, K. Pasternak, M. Szpetnar, P. Rosenbeiger, B. Tymczyna, and D. Niedziela. "Changes of amino acid concentrations in Polish Merino sheep between 21 and 150 days of life." Veterinární Medicína 59, No. 2 (March 27, 2014): 68–75. http://dx.doi.org/10.17221/7315-vetmed.

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The aim of this study was to evaluate plasma amino acid profiles and their interrelationships in male Polish Merino sheep at two different stages of their systemic development &ndash; at the neonatal monogastric stage and as a fully grown ruminant. Male lambs (n = 12, singles) were kept indoors in pens under standard rearing conditions and weaned at the age of 10 weeks of life. Blood samples were collected on day 21 and 150 of life. Free amino acids were determined in plasma using ion-exchange chromatography. There was a significant reduction in plasma amino acid concentrations between neo

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Regan, Sheena L. P., James R. McFarlane, Tim O'Shea, Nicholas Andronicos, Frank Arfuso, Arun Dharmarajan, and Ghanim Almahbobi. "Flow cytometric analysis of FSHR, BMRR1B, LHR and apoptosis in granulosa cells and ovulation rate in merino sheep." REPRODUCTION 150, no. 2 (August 2015): 151–63. http://dx.doi.org/10.1530/rep-14-0581.

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The aim of the present study was to determine the direct cause of the mutation-induced, increased ovulation rate in Booroola Merino (BB) sheep. Granulosa cells were removed from antral follicles before ovulation and post-ovulation from BB (n=5) and WT (n=12) Merino ewes. Direct immunofluorescence measurement of mature cell surface receptors using flow cytometry demonstrated a significant up-regulation of FSH receptor (FSHR), transforming growth factor beta type 1, bone morphogenetic protein receptor (BMPR1B), and LH receptor (LHR) in BB sheep. The increased density of FSHR and LHR provide nove

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Steel, J. W. "Effects of protein supplementation of young sheep on resistance development and resilience to parasitic nematodes." Australian Journal of Experimental Agriculture 43, no. 12 (2003): 1469. http://dx.doi.org/10.1071/ea03004.

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The influence of dietary protein content, particularly the supply of metabolisable protein, on immunocompetence and on resilience to pathogenic effects during continuous exposure of young sheep to infective larvae is reviewed for the most important abomasal and small intestinal nematodes infecting young sheep in Australian grazing systems. In lambs infected with Haemonchus contortus supplementary protein improves both development of immunity and resilience in breeds of sheep that are susceptible to haemonchosis, but in relatively resistant breeds dietary supplementation appears unnecessary. Re

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Pannier, L., G. E. Gardner, and D. W. Pethick. "Effect of Merino sheep age on consumer sensory scores, carcass and instrumental meat quality measurements." Animal Production Science 59, no. 7 (2019): 1349. http://dx.doi.org/10.1071/an17337.

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Slower growing Merino sheep often miss the lamb category and become yearlings. Yet, they may still produce meat of acceptable eating quality, thus opening the opportunity to develop high quality yearling products. Consumer sensory differences (tenderness, overall liking, juiciness, liking of flavour and liking of odour) of grilled wet-aged (5 days) steaks from the M. longissimus lumborum (LL) and M. semimembranosus (SM) derived from wether lamb (n = 185; average age 355 days) and wether yearling (n = 206; average age 685 days) Merinos were tested. Additionally, the age effect on carcass and in

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Adams, N. R., and P. B. Cronjé. "A review of the biology linking fibre diameter with fleece weight, liveweight, and reproduction in Merino sheep." Australian Journal of Agricultural Research 54, no. 1 (2003): 1. http://dx.doi.org/10.1071/ar02059.

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There is increasing economic pressure on the Merino industry to grow finer wool and at the same time to turn off more sheep meat. Fleece weight generally decreases with finer fibre diameters, so theoretically, finer wool sheep should be able to partition more nutrients to reproduction and muscle growth. However, complex and often indirect mechanisms appear to prevent this in practice. This review summarises the available data on genetic and phenotypic relationships between wool fibre diameter and fleece weight, liveweight, fatness, and reproductive performance, and develops mechanistic hypothe

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TRUKHACHEV, V., G. DZHAILIDY, V. SKRIPKIN, A. KULICHENKO, D. KOVALEV, M. SELIONOVA, M. AYBAZOV, E. TELEGINA, O. YATSYK, and A. KRIVORUCHKO. "The polymorphisms of MyoD1 gene in Manych Merino sheep and its influence on body conformation traits." Journal of the Hellenic Veterinary Medical Society 68, no. 3 (January 29, 2018): 319. http://dx.doi.org/10.12681/jhvms.15476.

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Candidate genes associated with meat productivity often affect the performance of myostatin and muscle development in general. The MyoD1 gene is a member of the myogenic regulatory factor (MRF) family and plays a key role in the differentiation of skeletal muscle cells in vertebrates. We investigated the structure of the MyoD1 gene. The effect of polymorphisms on meat production was studied in the Russian sheep breed Manych Merino. To detect alleles, we used NimbleGen sequencing technology (Roche, USA). In the Manych Merino breed, we found 14 single nucleotide polymorphisms (SNPs) associated w

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Wang, Xinyue, Jingjing Bao, Yazhen Bi, Wenping Hu, and Li Zhang. "Polymorphism, Expression, and Structure Analysis of a Key Gene ARNT in Sheep (Ovis aries)." Biology 11, no. 12 (December 10, 2022): 1795. http://dx.doi.org/10.3390/biology11121795.

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Growth traits are influential factors that significantly affects the development of the sheep industry. A previous TMT proteomic analysis found that a key protein in the HIF signaling pathway, ARNT, may influence embryonic skeletal muscle growth and development in sheep. The purpose of this study was to better understand the association between the polymorphisms of ARNT and growth traits of sheep, and the potential function of ARNT. Real-time qPCR (qRT-PCR) of ARNT was carried out to compare its expression in different developmental stages of the muscle tissues and primary myoblasts in the Hu,

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Raadsma, HW. "Fleece rot and body strike in Merino sheep. III. Significance of fleece moisture following experimental induction of fleece rot." Australian Journal of Agricultural Research 40, no. 4 (1989): 897. http://dx.doi.org/10.1071/ar9890897.

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The relationship between fleece wetting and drying characteristics and liability of sheep to fleece rot and body strike was examined following experimental wetting. The liability of sheep to fleece rot was reflected by both wetting and drying characteristics. Wetness of the fleece was estimated gravimetrically and was found to be a simple, fast and relatively robust technique. Moisture increased from 13% in the dry fleece up to 123% at skin level in sheep exposed from 0 to 10 days' wetting. Consistent differences were reported in proximal and full staple moisture levels between sheep affected

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Thompson, A. C. Toland, M. L. Hebart, N. M. Penno, and P. I. Hynd. "Perinatal wool follicle attrition coincides with elevated perinatal circulating cortisol concentration in Merino sheep." Australian Journal of Agricultural Research 58, no. 7 (2007): 748. http://dx.doi.org/10.1071/ar06327.

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The development of the follicle population in Merino sheep skin was studied from 30 days pre-partum to 112 days post-partum in single- and twin-born Merino lambs. The total number of primary follicles estimated from primary follicle density and skin surface area did not change over this period, while secondary follicle number increased to Day 28 post-partum in singles and Day 56 post-partum in twins. Twins had 14% fewer total follicles than singletons (P < 0.001), largely reflecting a bodyweight (hence estimated skin surface area) difference of 10%, with little difference in total follicle

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Vasseur, S., D. R. Paull, S. J. Atkinson, I. G. Colditz, and A. D. Fisher. "Effects of dietary fibre and feeding frequency on wool biting and aggressive behaviours in housed Merino sheep." Australian Journal of Experimental Agriculture 46, no. 7 (2006): 777. http://dx.doi.org/10.1071/ea05320.

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Wool biting is a behaviour that can develop in housed sheep, in which sheep start to bite and eat the wool of others. The aim of this study was to determine whether (i) supplementing the diet of housed sheep with fibre and (ii) increasing feeding frequency would help to reduce wool biting, aggressive behaviours and wool damage. In a 2 × 2 factorial experiment, 40 Merino wethers were either fed with lucerne-based pellets only, or with pellets supplemented with barley straw. They received their pellets either on a low feeding frequency basis (once a day Monday to Friday mornings, double ration o

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Lee, Caroline, Steve Colegate, and Andrew D. Fisher. "Development of a maze test and its application to assess spatial learning and memory in Merino sheep." Applied Animal Behaviour Science 96, no. 1-2 (January 2006): 43–51. http://dx.doi.org/10.1016/j.applanim.2005.06.001.

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Potter, B. J., G. H. McIntosh, M. T. Mano, P. A. Baghurst, J. Chavadej, C. H. Hua, B. G. Cragg, and B. S. Hetzel. "The effect of maternal thyroidectomy prior to conception on foetal brain development in sheep." Acta Endocrinologica 112, no. 1 (May 1986): 93–99. http://dx.doi.org/10.1530/acta.0.1120093.

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Abstract. Merino ewes were surgically thyroidectomized, and mated 6 weeks later when their plasma thyroxine (T4) levels were negligible. Their foetuses were delivered by hysterotomy at 52, 71, 84, 98, 125, 140 days gestation or at term (150 days). Despite the very low levels of T4 in maternal plasma, the concentrations of T4 in foetal plasma were not significantly different after 71 days gestation from those of foetuses of sham-operated (control) ewes. Foetal brain and body weights, however, were reduced from 71 days compared to those of foetuses of sham-operated ewes. The foetal brain weights

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Thomas, Dean T., Matt G. Wilmot, Mark Alchin, and David G. Masters. "Preliminary indications that Merino sheep graze different areas on cooler days in the Southern Rangelands of Western Australia." Australian Journal of Experimental Agriculture 48, no. 7 (2008): 889. http://dx.doi.org/10.1071/ea08061.

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High ambient temperature can decrease weight gain in livestock, but domestic livestock in extensive grazing systems may have some capacity to adjust their behaviour to reduce the impact of periods of high temperature. We hypothesised that sheep grazing in the semiarid Southern Rangelands of Western Australia would reduce distance travelled on days with high mean daily temperature. Eight Merino ewes were fitted with GPS collars for 3 weeks in a 5575-ha paddock on Carlaminda station (28°20′S, 116°41′E). Mean daily temperature was used to separate the 18 days of the study into three temperature c

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Conz, Christopher R. "Sheep, Scab Mites, and Society: The Process and Politics of Veterinary Knowledge in Lesotho, Southern Africa, c. 1900-1933." Environment and History 26, no. 3 (August 1, 2020): 383–412. http://dx.doi.org/10.3197/096734018x15440029363690.

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This paper reconstructs a sheep-dipping campaign in Lesotho, southern Africa to explore the historical dynamics between local social and political circumstances, ecological change and veterinary knowledge. African livestock owners and the British colonial government accelerated a biological transition from local breeds to non-native merino sheep in the early 1900s to produce wool. Wool-bearing sheep ushered in Psoroptes ovis, a parasitic mite that caused the skin condition called scab. Examining colonial Lesotho's anti-scab campaign from 1903 to 1933, its politics, ideas and procedures, improv

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Zhai, Bo, Lichun Zhang, Chunxin Wang, Zhuo Zhao, Mingxin Zhang, and Xu Li. "Identification of microRNA-21 target genes associated with hair follicle development in sheep." PeerJ 7 (June 27, 2019): e7167. http://dx.doi.org/10.7717/peerj.7167.

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Aim The target molecule regulatory function of microRNA-21 (miR-21) in multiple signalling pathways has become a main focus of genetic and pharmacological regulatory studies of various diseases. The identification of target genes for miRNA-21 in the development of hair follicles can provide new research pathways for the regulation of cell development. Methods In the present study, eight six-month-old ewes from Super Merino (SM) and Small Tailed Han (STH) sheep breeds were selected. Target prediction and dual-luciferase wild-type and mutant vectors were used to identify the target genes of miR-

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White, CL, DG Masters, DI Paynter, JMC Howell, SP Roe, MJ Barnes, and JG Allen. "The effects of supplementary copper and a mineral mix on the development of lupinosis in sheep." Australian Journal of Agricultural Research 45, no. 2 (1994): 279. http://dx.doi.org/10.1071/ar9940279.

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Lupinosis in grazing sheep is often associated with a potentially deleterious increase in the concentration of copper in the liver. Siromin�, a mineral mix developed by CSIRO for sheep on dry herbage and containing Cu at 116 mg/kg, was tested for its suitability for use with sheep consuming toxic lupin stubble, taking particular regard for dangers of Cu toxicity. There were three dietary treatments applied at two levels (either present or absent) to 40 Merino wethers for 8 weeks. Treatments consisted of adding Cu (10 mg Cu as CuS04/kg), minerals (25 g/kg as Siromin�) and toxic lupin stubble (5

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Dixon, T. J., S. I. Mortimer, and B. J. Norris. "16S rRNA gene microbial analysis of the skin of fleece rot resistant and susceptible sheep." Australian Journal of Agricultural Research 58, no. 7 (2007): 739. http://dx.doi.org/10.1071/ar06273.

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Fleece rot is a bacterial dermatitis that follows prolonged wetting of the sheep’s skin, and a major pre-disposing condition to body strike in the Australian Merino. Several studies have examined bacterial load of the fleece in relation to fleece rot using traditional culture-based techniques focussing on only a few bacterial species. We examined the natural bacterial diversity of the healthy sheep skin and changes that occurred in fleece-rot resistant and susceptible animals during fleece rot development. Presented is a preliminary molecular genetic analysis of the bacterial ecology of the sh

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Hua, Guoying, Xue Yang, Yuhao Ma, Tun Li, Jiankui Wang, and Xuemei Deng. "m6A Methylation Analysis Reveals Networks and Key Genes Underlying the Coarse and Fine Wool Traits in a Full-sib Merino Family." Biology 11, no. 11 (November 9, 2022): 1637. http://dx.doi.org/10.3390/biology11111637.

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In our study, a set of lambs with coarse wool type all over their bodies were discovered within a full-sib family during an embryo transfer experiment of merino fine wool sheep. The difference between coarse and fine wool traits were studied from the perspective of RNA modification-N6-methyladenosine. A total of 31,153 peaks were collected, including 15,968 peaks in coarse skin samples and 15,185 peaks in fine skin samples. In addition, 7208 genes were differentially m6A methylated, including 4167 upregulated and 3041 downregulated in coarse skin samples. Four key genes (EDAR, FGF5, TCHH, KRT2

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Tüfekci, Hacer, and Mustafa Olfaz. "Kastamonu İli Küçükbaş Hayvan Yetiştiriciliğinin Sorunları ve Çözüm Önerileri." Turkish Journal of Agriculture - Food Science and Technology 3, no. 7 (June 30, 2015): 577. http://dx.doi.org/10.24925/turjaf.v3i7.577-582.360.

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This study was conducted by using a survey made at 80 enterprises from 63 villages with the aim of determining situations, problems and solution proposals related to the sheep and goat farms in Kastamonu province. The average age of the farmers was 49.3 years. The farmers were 8.75% of primary school graduates, 68.75% of secondary school and also 22.6% of illiterate. The enterprises have raised animals as 31.75% of state + own land and 68.75%’ of private + leased land. Also they are kept the rate of 70% Hair goat, 30% Angora goat and 55% Merino sheep, 42.5% Akkaraman sheep, and 16.25% Turkmen

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Szabelska, Anna, Marcin R. Tatara, and Witold Krupski. "Morphometric, Densitometric, and Mechanical Properties of Maxillary Teeth in 5-Month-Old Polish Merino Sheep." Cells Tissues Organs 206, no. 4-5 (2018): 196–207. http://dx.doi.org/10.1159/000499479.

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This study was performed to determine morphological, densitometric, mechanical, and elemental characteristics of maxillary teeth in 5-month-old Polish Merino sheep. The total tooth volume (Tvol) was determined using quantitative computed tomography. Micro-computed tomography was used to determine the total enamel volume (Evol), volumetric enamel mineral density, total dentine volume (Dvol), volumetric dentine mineral density, and total tooth enamel and dentine volume (EDvol). Compression testing was used to determine the ultimate force of teeth. Microhardness of enamel and dentine was evaluate

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Han, Jilong, Tingting Guo, Yaojing Yue, Zengkui Lu, Jianbin Liu, Chao Yuan, Chune Niu, Min Yang, and Bohui Yang. "Quantitative proteomic analysis identified differentially expressed proteins with tail/rump fat deposition in Chinese thin- and fat-tailed lambs." PLOS ONE 16, no. 2 (February 2, 2021): e0246279. http://dx.doi.org/10.1371/journal.pone.0246279.

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Tail adipose as one of the important functional tissues can enhance hazardous environments tolerance for sheep. The objective of this study was to gain insight into the underlying development mechanisms of this trait. A quantitative analysis of protein abundance in ovine tail/rump adipose tissue was performed between Chinese local fat- (Kazakh, Hu and Lanzhou) and thin-tailed (Alpine Merino, Tibetan) sheep in the present study by using lable-free approach. Results showed that 3400 proteins were identified in the five breeds, and 804 were differentially expressed proteins, including 638 up regu

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Koynarski, T. "PrP gene polymorphism and its influence on some productive traits of sheepbreeds reared in Bulgaria." BULGARIAN JOURNAL OF VETERINARY MEDICINE 23, no. 2 (2020): 170–77. http://dx.doi.org/10.15547//bjvm.2219.

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The rapiddissemination of scrapie over the past few decades led to development of aspecific eradication programme, based on the polymorphisms within the prionprotein gene (PRNP). Current approach encourages the selection ofanimals carrying the resistant ARR/ARR genotype, while other genotypes areconsidered less preferable. Although the strategy seems to be working quitewell, farmers are concerned whether this will affect sheep productivity andsubsequently decrease net profits. The current study was aimed to elucidatethe linkage between the PrP gene polymorphism (based on codons 136,154 and 171

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Hodge, Marnie J., Sara de las Heras-Saldana, Sally J. Rindfleish, Cyril P. Stephen, and Sameer D. Pant. "Characterization of Breed Specific Differences in Spermatozoal Transcriptomes of Sheep in Australia." Genes 12, no. 2 (January 30, 2021): 203. http://dx.doi.org/10.3390/genes12020203.

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Reduced reproductive efficiency results in economic losses to the Australian sheep industry. Reproductive success, particularly after artificial insemination, is dependent on a number of contributing factors on both ewe and ram sides. Despite considerable emphasis placed on characterising ewe side contributions, little emphasis has been placed on characterising ram side contributions to conception success. Over 14,000 transcripts are in spermatozoa of other species, which are transferred to the ova on fertilisation. These transcripts conceivably influence early embryonic development and whethe

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