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Artigos de revistas sobre o tema "Sheep Reproduction"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 31 de janeiro de 2023

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1

Joshi, Purushotam. "NUTRITION AND REPRODUCTION IN SHEEP." FOOD & AGRIBUSINESS MANAGEMENT 3, no. 2 (2022): 48–52. http://dx.doi.org/10.26480/fabm.02.2022.48.52.

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High nutrition, but not overfeeding, has a positive effect on ewe reproductive capability in terms of the number of estrous cycles, length of the breeding season, greater ovulation rate, and improved lambing %. Copper deficiency hurts lambing percentage and lamb health. Manganese is required for the ovarian activity to be maintained. Protein is necessary for sheep for optimum sperm capacitation, conception rate, pregnancy, and reduced abortions. Protein insufficiency causes lower feed intake, poorer feed utilization, lower growth rate, lower milk output, and lower wool production. A possible r

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2

Haresign, W. "Reproduction in Sheep." Livestock Production Science 14, no. 4 (June 1986): 386–87. http://dx.doi.org/10.1016/0301-6226(86)90018-7.

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3

Dzakuma, J. M., and D. L. Harris. "Computer Modeling of Sheep Reproduction: II. Accelerated Reproduction in Sheep." Journal of Animal Science 67, no. 9 (September 1, 1989): 2212–21. http://dx.doi.org/10.2527/jas1989.6792212x.

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4

Brien, Forbes. "Foreword to ‘Sheep Reproduction’." Animal Production Science 54, no. 6 (2014): iv. http://dx.doi.org/10.1071/anv54n6_fo.

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5

Haresign, W. "Controlling reproduction in sheep." BSAP Occasional Publication 14 (January 1990): 23–37. http://dx.doi.org/10.1017/s0263967x00002020.

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AbstractIntravaginal progestagen pessaries + pregnant mare's serum gonadotrophin (PMSG) for controlling the oestrous cycle and for inducing out-of-season breeding have been commercially available for many years. However, extremely good mating management is required if acceptable results are to be achieved. More recently the role of the pineal hormone, melatonin, in the regulation of seasonal breeding has been recognized, and this has led to the development of slow-release formulations for use under farm conditions. Early indications are that such preparations can advance the breeding season by

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6

DEAC, Alexandru Marius, Adriana Sebastiana MUSCĂ, Marius Gavril AIPĂTIOAIE, Viorica COŞIER, and Marius ZĂHAN. "Methods of Improving Reproductive Parameters in Sheep and The Major Genes Associated with Prolificacy: A Review." Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Animal Science and Biotechnologies 1, no. 79 (May 11, 2022): 7. http://dx.doi.org/10.15835/10.15835/buasvmcn-asb:2021.0020.

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Farm profitability is heavily influenced by reproductive capacity. Fertility, prolificacy, and fecundity are all indicators of reproductive efficiency. In sheep with high economic value, prolificacy is a key reproduction parameter (Notter, 2008). Because most sheep breeds are monotocous, similar to Mouflon wild sheep (Garel et al., 2005), improving fecundity is a serious concern (Tang et al., 2019). This review aims to study genes and the genetic means of improving sheep reproduction parameters. Numerous mutations in the transforming growth factor (TGF) superfamily have been reported to influe

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7

Rosa, H. J. D., and M. J. Bryant. "Seasonality of reproduction in sheep." Small Ruminant Research 48, no. 3 (June 2003): 155–71. http://dx.doi.org/10.1016/s0921-4488(03)00038-5.

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8

Matoušek, J. "Genetics of reproduction in sheep." Animal Reproduction Science 11 (January 1986): 235–36. http://dx.doi.org/10.1016/0378-4320(86)90125-9.

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9

HE, MINGFENG, QIU-HUI PAN, and SHUANG WANG. "FINAL STATE OF ECOSYSTEM CONTAINING GRASS, SHEEP AND WOLVES WITH AGING." International Journal of Modern Physics C 16, no. 01 (January 2005): 177–90. http://dx.doi.org/10.1142/s0129183105007017.

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This paper describes a cellular automata model containing movable wolves, sheep and reproducible grass. Each wolf or sheep is characterized by Penna bitstrings. In addition, we introduce the energy rule and the predator–prey mechanism for wolf and sheep. With considering age-structured, genetic strings, minimum reproduction age, cycle of the reproduction, number of offspring, we get three possible states of a predator–prey system: the coexisting one with predators and prey, the absorbing one with prey only, and the empty one where no animal survived. In this paper, we mainly discuss the effect

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10

Qiu, Xiaoyan, Xiong Xiao, Nan Li, Wenhui Ling, Mingyu Wang, and Yuemin Li. "Association of steroid 17-alpha-hydroxylase/17,20 lyase (CYP17) single nucleotide polymorphism (SNP) 628 and dopamine receptor D2 (DRD2) SNP939 genotypes with sheep reproductive performance." Reproduction, Fertility and Development 31, no. 4 (2019): 743. http://dx.doi.org/10.1071/rd18069.

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In a previous study we investigated the association between two single nucleotide polymorphism (SNP) genotypes, namely steroid 17-alpha-hydroxylase/17,20 lyase (CYP17) SNP628 and dopamine receptor D2 (DRD2) SNP939, with two temperaments (calm and nervous) in Australian Merino sheep and concluded that the DRD2 SNP939 T/T genotype combined with the CYP17 SNP628 G/G genotype is associated with a calm temperament and could be used as a potential marker for calm sheep, whereas the DRD2 SNP939C allele combined with the CYP17 SNP628 A/A genotype is associated with a nervous temperament and could be u

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11

Lahlou-Kassi, A., S. Benlamlih, and R. Boukliq. "Reproduction and adaptation characteristics in D’man sheep." Agricultural and Food Science 60, no. 6 (October 1, 1988): 566–75. http://dx.doi.org/10.23986/afsci.72314.

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D’man breed (D) is found in the oasis of the subsaharian regions of Morocco and reared usually in sedentary type of management with small flocks (< 10 ewes). Preliminary field surveys showed that D is early maturing, prolific and aseasonal. Hence, a multidisciplinary research programme on D was started in 1974. This paper reports the findings of these studies and describes the approach used to (1) characterize and evaluate the performances of D in field and station, (2) study the physiological mechanism involved in its peculiar reproduction and production, (3) study the genetic basis of rep

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12

Richards, J. S., M. A. Sladek, and G. J. Lee. "Cumulative reproductive performance effect on overall lifetime productivity in Merino sheep." Animal Production Science 58, no. 8 (2018): 1470. http://dx.doi.org/10.1071/an17794.

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Reproduction is an important driver of profitability in commercial sheep flocks. Historically, Merino flocks have been run with a fixed age structure, ignoring individual merit and casting for age at a specific age. More recently, research has focussed on utilising the variation within age groups by keeping productive older ewes longer and culling less productive ewes earlier. Previous studies have also examined the effect of age on reproduction and the impact of reproduction status on productivity, but little research has been conducted on cumulative effects of reproductive performance on lat

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13

Blache, Dominique, and Samantha L. Bickell. "Temperament and reproductive biology: emotional reactivity and reproduction in sheep." Revista Brasileira de Zootecnia 39, suppl spe (July 2010): 401–8. http://dx.doi.org/10.1590/s1516-35982010001300044.

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Reproductive capacity is controlled by a large number of factors such as season, social interactions and metabolic status. However, the influence of emotional reactivity on reproductive success has not been intensively investigated in farm animals. In this review, we define emotion reactivity and the expression of its inter individual variability named temperament. We briefly describe our protocol to measure temperament in sheep and discuss the heritability of temperament traits. Using the results obtained from our flock of sheep selected for calm or nervous temperament, we illustrate how this

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14

Lianou, Daphne T., Natalia G. C. Vasileiou, Charalambia K. Michael, Irene Valasi, Vasia S. Mavrogianni, Mariangela Caroprese, and George C. Fthenakis. "Patterns of Reproductive Management in Sheep and Goat Farms in Greece." Animals 12, no. 24 (December 7, 2022): 3455. http://dx.doi.org/10.3390/ani12243455.

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This paper reports findings regarding patterns of reproductive management in 325 sheep flocks and 119 goat herds throughout Greece. The objectives were to describe the patterns of reproductive management in sheep and goat farms, to highlight factors that were associated with these management patterns and the clinical application of the various reproductive management approaches in the farms and to establish potential associations with production outcomes. The median months of the start of the mating period for adult sheep and goats were May and June, respectively and for ewe lambs and replacem

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15

Dolebo, Asrat Tera, Negar Khayatzadeh, Aberra Melesse, David Wragg, Mourad Rekik, Aynalem Haile, Barbara Rischkowsky, Max F. Rothschild, and Joram M. Mwacharo. "Genome-wide scans identify known and novel regions associated with prolificacy and reproduction traits in a sub-Saharan African indigenous sheep (Ovis aries)." Mammalian Genome 30, no. 11-12 (November 22, 2019): 339–52. http://dx.doi.org/10.1007/s00335-019-09820-5.

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Abstract Maximizing the number of offspring born per female is a key functionality trait in commercial- and/or subsistence-oriented livestock enterprises. Although the number of offspring born is closely associated with female fertility and reproductive success, the genetic control of these traits remains poorly understood in sub-Saharan Africa livestock. Using selection signature analysis performed on Ovine HD BeadChip data from the prolific Bonga sheep in Ethiopia, 41 candidate regions under selection were identified. The analysis revealed one strong selection signature on a candidate region

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16

Brien, Forbes. "Foreword to ‘Sheep Reproduction: Part 2’." Animal Production Science 56, no. 4 (2016): iii. http://dx.doi.org/10.1071/anv56n4_fo.

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17

Rasmusen, B. A., and Elizabeth M. Tucker. "Transferrin types and reproduction in sheep." Animal Blood Groups and Biochemical Genetics 4, no. 4 (April 24, 2009): 207–20. http://dx.doi.org/10.1111/j.1365-2052.1973.tb01301.x.

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18

Fahmy, M. H. "Major genes for reproduction in sheep." Small Ruminant Research 8, no. 4 (September 1992): 361–62. http://dx.doi.org/10.1016/0921-4488(92)90219-t.

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19

Notter, DR. "Genetic Aspects of Reproduction in Sheep." Reproduction in Domestic Animals 43 (July 2008): 122–28. http://dx.doi.org/10.1111/j.1439-0531.2008.01151.x.

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20

Novotniné Dankó, Gabriella. "Some Practical and Biotechnological Methods for Improving Reproduction Traits in Sheep." Acta Agraria Debreceniensis, no. 11 (September 15, 2003): 15–20. http://dx.doi.org/10.34101/actaagrar/11/3437.

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However, reproduction in sheep is seasonal, many breeds of sheep are able to mate not only in autumn, but out-of-season as well. The main factor determining seasonality is the photoperiod, but other factors can influence reproductive pattern, such as genetics, management practices and social cues. The fertility of spring and early summer breeding is usually lower; this imposes the need for alternative methods (e.g. hormonal treatments, biotechnological practice), to increase the conception rate.The author summarize the main practical techniques and biotechnological methods for controlling repr

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21

Carrick, MJ. "Sheep Reproduction Modelled as a Markov Series. I. The Model." Australian Journal of Biological Sciences 41, no. 1 (1988): 133. http://dx.doi.org/10.1071/bi9880133.

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Sheep reproduction from ovulation to weaning was modelled as a Markov series of multiple binomial distributions, which required a minimum of assumptions and a small number of parameters for the entire reproductive process. Methods of constructing the model and of estimating the parameters are described, and results from simulated example flocks with different ovulatory potentials are presented. A variety of potential applications, for example as an adjunct to economic modelling and methods of validation and use in the analysis of reproductive experiments, are discussed.

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22

Petrovic, Milan, V. Caro-Petrovic, D. Ruzic-Muslic, N. Maksimovic, Z. Ilic, B. Milosevic, and J. Stojkovic. "Some important factors affecting fertility in sheep." Biotehnologija u stocarstvu 28, no. 3 (2012): 517–28. http://dx.doi.org/10.2298/bah1203517p.

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Efficiency of sheep production is conditioned by fertility. According to some authors number of offspring obtained per lambing is more important than gain of weight. Genetic relationships involving reproductive traits were seldom studied. Reproductive traits have low heritabilities, a discrete phenotypic expression, and are expressed only in sexually mature ewes leading to low selection intensities and long generation intervals. Documentation of realized selection response is also often complicated by the low heritabilities of fertility traits. Existence of a major gene affecting prolificacy h

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23

AIBAZOV, А. М. М. "RESULTS AND PROSPECTS OF THE USE OF ASSISTED REPRODUCTIVE TECHNOLOGIES IN REPRODUCTION OF SMALL RUMINANTS’S ANIMAL." Sheep, goats, woolen business, no. 2 (2022): 8–14. http://dx.doi.org/10.26897/2074-0840-2022-2-8-14.

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The article discusses the most common ART (artificial insemination, cryopreservation of sperm and creation of storage facilities, induction and synchronization of sexual reproduction), as well as ART used in rare cases (technology of superovulation induction and embryo transfer, in-vitro embryo production, embryo cryopreservation, transgenesis). The author presents the results of own long-term research on the development of biotechnological methods and methods of increasing the reproductive qualities of sheep and goats. The reasons for the rare use of multiple ovulation and embryotransplantati

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24

He, Xiaoyun, Qiuyue Liu, Xiaoyu Li, Xiaofei Guo, Xiangyu Wang, Wenping Hu, Ran Di, and Mingxing Chu. "Molecular cloning and epigenetic change detection of Kiss1 during seasonal reproduction in Chinese indigenous sheep." Reproduction, Fertility and Development 30, no. 5 (2018): 734. http://dx.doi.org/10.1071/rd17028.

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Like most seasonal domesticated species, sheep are short-day breeders, which means that the reproduction axis is activated by short days. The annual photoperiodic cycle affects the amount of daylength information that is transmitted to the hypothalamic–pituitary–gonadal (HPG) axis by regulating pulsatile secretion of gonadotrophin-releasing hormone from the hypothalamus. Kisspeptin, which is encoded by Kiss1, plays a major role in reproductive seasonality. Based on results from our previous Solexa sequencing data obtained from Tan (T) and Small Tail Han (STH) sheep during anoestrus and the bre

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25

Chang, Cheng, Xiaoyun He, Ran Di, Xiangyu Wang, Miaoceng Han, Chen Liang, and Mingxing Chu. "Thyroid Transcriptomic Profiling Reveals the Follicular Phase Differential Regulation of lncRNA and mRNA Related to Prolificacy in Small Tail Han Sheep with Two FecB Genotypes." Genes 13, no. 5 (May 10, 2022): 849. http://dx.doi.org/10.3390/genes13050849.

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Long non-coding RNA (lncRNA) accounts for a large proportion of RNA in animals. The thyroid gland has been established as an important gland involved in animal reproduction, however, little is known of its gene expression patterns and potential roles in the sheep. Herein, RNA-Seq was used to detect reproduction-related differentially expressed lncRNAs (DELs) and mRNAs (DEGs) in the follicular phase (FT) FecBBB (MM) and FecB++ (ww) genotypes of Small Tail Han (STH) sheep thyroids. Overall, 29 DELs and 448 DEGs in thyroid between MM and ww sheep were screened. Moreover, GO and KEGG enrichment an

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26

Wang, Wei, Xiaoyun He, Ran Di, Xiangyu Wang, and Mingxing Chu. "Transcriptome Analysis Revealed Long Non-Coding RNAs Associated with mRNAs in Sheep Thyroid Gland under Different Photoperiods." Genes 13, no. 4 (March 28, 2022): 606. http://dx.doi.org/10.3390/genes13040606.

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The thyroid gland is a vital endocrine organ involved in the reproduction of animals via the regulation of hormone synthesis and secretion. LncRNAs have been proven to play important roles in reproductive regulation; however, the associated mechanism in the thyroid gland has not been clarified. In this study, we investigated to identify photoperiod-induced lncRNAs and mRNAs in the thyroid gland in Sunite ewes by comparing the expression profiles of short photoperiod (SP) and long photoperiods (LP). A total of 41,088 lncRNAs were identified in the thyroid gland through RNA-Seq. Functional analy

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27

Fu, Xiaoyu, Yanan Yang, Zunqiang Yan, Miaomiao Liu, and Xinrong Wang. "Transcriptomic Study of Spermatogenesis in the Testis of Hu Sheep and Tibetan Sheep." Genes 13, no. 12 (November 25, 2022): 2212. http://dx.doi.org/10.3390/genes13122212.

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Numerous genes involved in male reproduction regulate testis development and spermatogenesis. In this study, the testis tissue transcriptome was used to identify candidate genes and key pathways associated with fecundity in sheep. Histological analysis of testis tissue using hematoxylin–eosin (HE) routine staining was performed for two sheep breeds. Overall, 466 differentially expressed genes (DEGs) were identified between Hu sheep (HS) and Tibetan sheep (TS) through RNA sequencing technology (RNA-Seq), including 226 upregulated and 240 downregulated genes. Functional analysis showed that seve

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28

Kennedy, Karen J., Nathan S. Boyd, Vilis O. Nams, and A. Randall Olson. "The Impacts of Fertilizer and Hexazinone on Sheep Sorrel (Rumex acetosella) Growth Patterns in Lowbush Blueberry Fields." Weed Science 59, no. 3 (September 2011): 335–40. http://dx.doi.org/10.1614/ws-d-10-00088.1.

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Sheep sorrel is an invasive, creeping perennial weed of lowbush blueberry fields that decreases yields and hinders harvest. Much of the basic phenology of sheep sorrel in blueberry fields is unknown and not documented in peer-reviewed journals. Three levels of fertilizer (0, 20, and 40 kg N ha−1) and two levels of hexazinone (0 and 1.92 kg ai ha−1) were applied to three vegetative-year blueberry fields to determine their effects on root and shoot growth, biomass allocation, and seed production of sheep sorrel plants. Hexazinone efficacy varied widely between sites, but suppressed shoot biomass

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29

Sodiq, Akhmad. "Identifikasi Sistim Produksi dan Keragaan Produktivitas Domba Ekor Gemuk di Kabupaten Brebes Propinsi Jawa-Tengah." Jurnal Agripet 10, no. 1 (April 1, 2010): 25–31. http://dx.doi.org/10.17969/agripet.v10i1.634.

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Identification of production system and productivity level of fat tailed sheep in brebes regency of central javaABSTRACT. Reproductive performance is one of the main determinants of productivity of the sheep. This applies to the breeding of animal for meat production. High reproduction rates are essential for profit in meat sheep production and determined by the number of progeny delivered in a given period of time. The level of reproductive performance is dependent on the interaction of genetic and environmental factors. The evaluation of reproductive performance of a local and adapted breed

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Maclachlan, N. J., J. E. Crafford, W. Vernau, I. A. Gardner, A. Goddard, A. J. Guthrie, and E. H. Venter. "Experimental Reproduction of Severe Bluetongue in Sheep." Veterinary Pathology 45, no. 3 (May 2008): 310–15. http://dx.doi.org/10.1354/vp.45-3-310.

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Lehman, Michael N., Zamin Ladha, Lique M. Coolen, Stanley M. Hileman, John M. Connors, and Robert L. Goodman. "Neuronal plasticity and seasonal reproduction in sheep." European Journal of Neuroscience 32, no. 12 (December 2010): 2152–64. http://dx.doi.org/10.1111/j.1460-9568.2010.07530.x.

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32

Talafha, Abdelsalam Q., and Mohammed M. Ababneh. "Awassi sheep reproduction and milk production: review." Tropical Animal Health and Production 43, no. 7 (April 21, 2011): 1319–26. http://dx.doi.org/10.1007/s11250-011-9858-5.

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Zhang, Zhuangbiao, Jishun Tang, Ran Di, Qiuyue Liu, Xiangyu Wang, Shangquan Gan, Xiaosheng Zhang, Jinlong Zhang, Wenping Hu, and Mingxing Chu. "Comparative Transcriptomics Reveal Key Sheep (Ovis aries) Hypothalamus LncRNAs that Affect Reproduction." Animals 9, no. 4 (April 8, 2019): 152. http://dx.doi.org/10.3390/ani9040152.

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The diverse functions of long noncoding RNAs (lncRNAs), which execute their functions mainly through modulating the activities of their target genes, have been have been widely studied for many years (including a number of studies involving lncRNAs in the ovary and uterus). Herein, for the first time, we detect lncRNAs in sheep hypothalami with FecB++ through RNA Sequencing (RNA-Seq) and identify a number of known and novel lncRNAs, with 622 and 809 found to be differentially expressed in polytocous sheep in the follicular phase (PF) vs. monotocous sheep in the follicular phase (MF) and polyto

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Barr, A. Catherine, Bruce Abbitt, Robert A. Fiske, John T. Jaques, Heather R. Maynard, and John C. Reagor. "Reproductive Effects of Fenoxycarb on Sheep." Journal of Veterinary Diagnostic Investigation 9, no. 4 (October 1997): 401–6. http://dx.doi.org/10.1177/104063879700900410.

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Fenoxycarb (ethyl [2-(4-phenoxyphenoxy)-ethyl] carbamate) is an insect growth regulator used for long-term fire ant control. Because of its effects on insect reproduction and its potential use on pasturage consumed by food animals, a reproductive study was conducted using Rambouillet sheep. The sheep were dosed daily with a placebo or with fenoxycarb at 0.69 or 1.38 mg/kg/day, representing ten (10X) and 20 times (20X) the maximum amounts of fenoxycarb in forage or hay treated at recommended levels for fire ant control. Parameters that were measured included rates of weight gain of adults, seru

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35

Rakib, Md, Nure Desha, Md Rahman, Md Kabir, Farzana Yasmin, Md Alam, Sonia Akther, and Nasrin Sultana. "Environmental adaptability, morphometric features with reproductive and productive potentialities of indigenous sheep in Bangladesh." Journal of Advanced Veterinary and Animal Research 9, no. 4 (2022): 649. http://dx.doi.org/10.5455/javar.2022.i634.

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Indigenous sheep are highly adaptable and widely distributed in different regions of Bangladesh. They are famous for their tolerance to harsh environmental conditions, low demand for feed, and disease resistance with minimum or no housing and management facilities. Ample indiscrimi¬nate research reports and case studies on the native sheep of Bangladesh have been published. Nonetheless, a comprehensive review of reproductive and productive performances, as well as their various morphometric physiognomies and climate resilience capabilities, is lacking. This review was designed to explore and s

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Merkley, Christina M., Allison N. Renwick, Sydney L. Shuping, KaLynn Harlow, Jeffrey R. Sommer, and Casey C. Nestor. "Undernutrition reduces kisspeptin and neurokinin B expression in castrated male sheep." Reproduction and Fertility 1, no. 1 (October 31, 2020): 21–33. http://dx.doi.org/10.1530/raf-20-0025.

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Undernutrition impairs reproductive success through suppression of gonadotropin-releasing hormone (GnRH), and subsequently luteinizing hormone (LH), secretion. Given that kisspeptin and neurokinin B (NKB) neurons in the arcuate nucleus (ARC) of the hypothalamus are thought to play key stimulatory roles in the generation of GnRH/LH pulses, we hypothesized that feed restriction would reduce the ARC mRNA abundance and protein expression of kisspeptin and NKB in young, male sheep. Fourteen wethers (castrated male sheep five months of age) were either fed to maintain (FM; n = 6) pre-study body weig

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Zhang, Zhuangbiao, Jishun Tang, Xiaoyun He, Mingxia Zhu, Shangquan Gan, Xiaofei Guo, Xiaosheng Zhang, Jinlong Zhang, Wenping Hu, and Mingxing Chu. "Comparative Transcriptomics Identify Key Hypothalamic Circular RNAs that Participate in Sheep (Ovis aries) Reproduction." Animals 9, no. 8 (August 14, 2019): 557. http://dx.doi.org/10.3390/ani9080557.

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Circular RNA (circRNA), as an emerging class of noncoding RNA, has been found to play key roles in many biological processes. However, its expression profile in the hypothalamus, a powerful organ initiating the reproductive process, has not yet been explored. Therefore, we used RNA sequencing to explore the expression of circRNAs in the hypothalamus of sheep with the FecB ++ genotype. We totally identified 41,863 circRNAs from sheep hypothalamus, in which 333 (162 were upregulated, while 171 were downregulated) were differentially expressed in polytocous sheep in the follicular phase versus mo

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Sultan, Ahammad, Md Rashedul Islam, Rakesh Kumer Yadav, Rupaly Akhter, and Jalal Uddin Ahmed. "Prevalence of different reproductive disorders of small ruminants in five upazillas of Mymensingh district." Asian Journal of Medical and Biological Research 1, no. 1 (November 4, 2015): 74–79. http://dx.doi.org/10.3329/ajmbr.v1i1.25501.

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Small ruminants (goat and sheep) are economically important and promising animal resource in Bangladesh. Reproductive disorders of goat and sheep cause the great economic problems. Therefore, the aim of the study was to investigate the prevalence of reproductive disorders in goat and sheep in five upazillas of Mymensingh district. Records of reproductive disorders were collected from official stock book of different Upazillas veterinary hospitals of Mymensingh district during April 2010 to March 2011. Seasonal occurrences of reproductive disorders were also recorded. Descriptive statistical an

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Huisman, A. E., D. J. Brown, A. J. Ball, and H. U. Graser. "Genetic parameters for bodyweight, wool, and disease resistance and reproduction traits in Merino sheep. 1. Description of traits, model comparison, variance components and their ratios." Australian Journal of Experimental Agriculture 48, no. 9 (2008): 1177. http://dx.doi.org/10.1071/ea08119.

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Both wool and sheep meat industries are interested in sheep that have a high reproduction performance and are resistant to internal parasites, in addition to the traditional traits. There is considerable interest in breeding sheep for wool, carcass, reproductive and internal parasite resistance traits simultaneously. The objective of this study was to estimate single trait genetic parameters for 40 traits recorded in Merino sheep, covering bodyweight, carcass, wool, reproduction and internal parasite resistance traits. This also involved determining the appropriate models. The results from thi

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Ralph, C. R., M. N. Lehman, R. L. Goodman, and A. J. Tilbrook. "Impact of psychosocial stress on gonadotrophins and sexual behaviour in females: role for cortisol?" Reproduction 152, no. 1 (July 2016): R1—R14. http://dx.doi.org/10.1530/rep-15-0604.

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This review focuses on the importance of cortisol in mediating the inhibitory effects of psychosocial stress on reproduction in females. In particular, we have summarized our research in sheep where we have systematically established whether cortisol is both sufficient and necessary to suppress reproductive hormone secretion and inhibit sexual behaviour. Our findings are put into context with previous work and are used to develop important concepts as well as to identify productive further lines of investigation. It is clear that cortisol is necessary to inhibit some, but not all, aspects of r

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Walkom, S. F., and D. J. Brown. "Impact of liveweight, fat and muscle sire breeding values on ewe reproduction is minimal but variable across Australian grazing systems." Animal Production Science 57, no. 9 (2017): 1952. http://dx.doi.org/10.1071/an15574.

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Australian sheep producers have the potential to improve reproductive rates through optimising ewe body condition across the production cycle. Managing ewe body condition can become costly when supplementary feeding is required due to poor pasture growth or rainfall and by using appropriate genetics, producers can theoretically reduce the flock’s dependency on supplementary feed and improve reproductive rates. Reproductive records from the Information Nucleus Flock and Sheep Genetics Merino and maternal breed datasets were analysed to examine the influence of sire breeding values for liveweigh

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Li, Zhifeng, Xiaoyun He, Xiaosheng Zhang, Jinlong Zhang, Xiaofei Guo, Wei Sun, and Mingxing Chu. "Analysis of Expression Profiles of CircRNA and MiRNA in Oviduct during the Follicular and Luteal Phases of Sheep with Two Fecundity (FecB Gene) Genotypes." Animals 11, no. 10 (September 28, 2021): 2826. http://dx.doi.org/10.3390/ani11102826.

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CircRNA and miRNA, as classes of non-coding RNA, have been found to play pivotal roles in sheep reproduction. There are many reports of circRNA and miRNA in the ovary and uterus, but few in the oviduct. In this study, RNA-Seq was performed to analyze the expression profile of circRNA and miRNA in the oviduct during the follicular phase and luteal phase of sheep with FecBBB and FecB++ genotypes. The results showed that a total of 3223 circRNAs and 148 miRNAs were identified. A total of 15 DE circRNAs and 40 DE miRNAs were found in the comparison between the follicular phase and luteal phase, an

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de Vries, F., H. Hamann, C. Drögemüller, M. Ganter, and O. Distl. "Analysis of associations between the prion protein genotype and reproduction traits in meat sheep breeds." Animal Science 79, no. 3 (December 2004): 397–404. http://dx.doi.org/10.1017/s1357729800090263.

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AbstractThe objective of this study was to analyse the associations between ovine prion protein (PrP) genotypes and reproduction traits in three German meat sheep breeds. Reproduction traits were age at first early lambing, age at first late lambing, first lambing interval, second lambing interval and total number of lambs born. The data set included 595 genotyped German Texel sheep among 5225 recorded sheep, 351 genotyped German Black-Headed Mutton among 10 177 sheep and 282 genotyped Suffolk sheep among 2849 sheep. Linear animal models were employed for the analysis of the PrP-genotype effec

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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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Gruszecki, Tomasz M., Monika Greguła-Kania, Roman Niżnikowski, Mirosław Pięta, Krzysztof Kostro, Anna Szymanowska, Anna Miduch, and Ewa Strzelec. "Effect of PRNP Gene Polymorphism on Reproductive Performance of Mother Sheep and their Offspring Growth." Bulletin of the Veterinary Institute in Pulawy 56, no. 3 (September 1, 2012): 279–82. http://dx.doi.org/10.2478/v10213-012-0050-0.

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Abstract The polymorphism of prion protein (PrP) amino acids in codons 136 (A/V), 154 (R/H); and 171 (Q/R/H) was established. Reproductive performance of mother sheep was evaluated analysing the fertility coefficient and litter size, i.e. the number of born and reared lambs. The studies included mothers of synthetic lines BCP - 111 sheep and SCP - 104 sheep born in 2001-2007. In the examined ovine PRNP gene, the following four alleles were identified: ARR, AHQ, ARQ, and VRQ, with the absence of the ARH allele. The highest frequency was determined for the ARR (49.8%) and ARQ (45.8%) alleles. In

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Khan, N. N., N. Assad, Nishant Kumar, D. Chakraborty, Aadil Ayaz, Mashooq Ahmad Dar, Aarif Ali, and Suheel Yousuf Wani. "Genetic Parameters of Reproduction Traits in Rambouillet Sheep." International Journal of Current Microbiology and Applied Sciences 6, no. 8 (August 10, 2017): 2090–94. http://dx.doi.org/10.20546/ijcmas.2017.608.248.

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Loi, Pasqualino, Grazyna Ptak, Maria Dattena, Sergio Ledda, Salvatore Naitana, and Pietro Cappai. "Embryo transfer and related technologies in sheep reproduction." Reproduction Nutrition Development 38, no. 6 (1998): 615–28. http://dx.doi.org/10.1051/rnd:19980604.

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Abecia, José A., Fernando Forcada, and Antonio González-Bulnes. "Pharmaceutical Control of Reproduction in Sheep and Goats." Veterinary Clinics of North America: Food Animal Practice 27, no. 1 (March 2011): 67–79. http://dx.doi.org/10.1016/j.cvfa.2010.10.001.

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Zhulinska, O. S., S. L. Drozd, and S. V. Mohylnytska. "ANALYSIS OF REPRODUCTION OF SHEEP OF ASKANIAN SELECTION." Animal Biology 18, no. 3 (September 2016): 36–45. http://dx.doi.org/10.15407/animbiol18.03.036.

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OHUCHI, Nozomu, Kuniji YAMAKI, Toshihiro YAMAGISHI, Masami SUZUKI, Masaaki TADA, and Tomoo KONNNO. "Reproduction in the Three Different Breeds of Sheep." Japanese Journal of Sheep Science 1993, no. 30 (1993): 43–47. http://dx.doi.org/10.11595/jpnjsheepsci1964.1993.43.

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