Bibliografías temáticas / Livestock – Reproduction

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Literatura académica sobre el tema "Livestock – Reproduction"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 13 de febrero de 2022

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Artículos de revistas sobre el tema "Livestock – Reproduction"

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Fahmy, M. H. "Livestock reproduction in latin America". Small Ruminant Research 4, n.º 4 (mayo de 1991): 403–4. http://dx.doi.org/10.1016/0921-4488(91)90086-6.

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Rohrer, Gary Alan. "An overview of genomics research and its impact on livestock reproduction". Reproduction, Fertility and Development 16, n.º 2 (2004): 47. http://dx.doi.org/10.1071/rd03077.

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The amount of information currently available about the genomes of many livestock species, especially cattle and pigs, has increased dramatically in the past few years and the rate of its accumulation will continue to increase. A large number of scientific ‘tools’ is currently available for research aimed at understanding biological processes important to livestock production. These resources are being used to understand biological processes regulating reproduction, body composition and immune function in all livestock species. This research will create many opportunities to develop new tools for the improvement of livestock production. The best commercial application of genomics is in conjunction with reproductive enhancing technologies, such as artificial insemination, embryo transfer and cloning.
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Poole, Rebecca K. y Daniel H. Poole. "Impact of Ergot Alkaloids on Female Reproduction in Domestic Livestock Species". Toxins 11, n.º 6 (21 de junio de 2019): 364. http://dx.doi.org/10.3390/toxins11060364.

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Fescue toxicosis is a multifaceted syndrome that elicits many negative effects on livestock consuming ergot alkaloids produced by endophyte-infected tall fescue. The economic losses associated with fescue toxicosis are primarily due to reproductive failure including altered cyclicity, suppressed hormone secretion, reduced pregnancy rates, agalactia, and reduced offspring birth weights. For decades, a multitude of research has investigated the physiological and cellular mechanisms of these reproductive failures associated with fescue toxicosis. This review will summarize the various effects of ergot alkaloids on female reproduction in grazing livestock species.
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Mihaylova, D., A. Krastanov y N. Vasilev. "Non-hormonal feed additives as an alternative in animal reproduction". Trakia Journal of Sciences 18, n.º 4 (2020): 405–11. http://dx.doi.org/10.15547/tjs.2020.04.016.

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Nowadays, a modern trend of the animal husbandry is to increase the reproductive potential of livestock and poultry. There is a large interest worldwide in discovering new and safe non-hormonal biologically active substances obtained from natural sources, which could substitute the synthetic hormones. The positive influence on reproduction in livestock of the biologically active substances of natural origin such as isoflavones, carotenoids, minerals, phytohormones, PUFAs, etc. represent a potential alternative. These substances are derived from various plant sources and micro and macro algae as well. In addition, those substances could provoke positive changes in animal reproduction practices, corresponding to the modern EU requirements for quality and safe for the human health nutrients. The present mini-review summarizes the known in respect of the trend of substitution of the hormonal ones and outlines the potential non-hormonal additives in livestock husbandry.
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Shashank, C. G., N. Anand Kumar y P. S. Banakar. "Mystic Effects of Kisspeptin in Reproduction of Livestock". International Journal of Current Microbiology and Applied Sciences 7, n.º 07 (10 de julio de 2018): 2140–47. http://dx.doi.org/10.20546/ijcmas.2018.707.251.

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Porter, J. K. y F. N. Thompson. "Effects of fescue toxicosis on reproduction in livestock". Journal of Animal Science 70, n.º 5 (1 de mayo de 1992): 1594–603. http://dx.doi.org/10.2527/1992.7051594x.

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Pestis, V. K., L. V. Golubets y A. S. Deshko. "Assisted reproductive technologies in cattle reproduction and selection". Proceedings of the National Academy of Sciences of Belarus. Agrarian Series 57, n.º 2 (18 de mayo de 2019): 192–203. http://dx.doi.org/10.29235/1817-7204-2019-57-2-192-203.

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In vitro technology is one of the most dynamically developing and more and more stable biotechnological methods today accelerating selection, intensifying reproductive and genetic potential of breeding animals, allowing to increase breeding young animals production by one champion cow up to 5–10 calves per year, reduce generation interval and significantly accelerate process of updating and qualitative improvement of livestock. However, obtaining oocytes competent for in vitro development is one of the critical factors determining success of the method and depending on a number of biological and technical factors. This paper presents results of studies on effect of biological factors of direct and indirect impact on efficiency of obtaining oocytes in the system of transvaginal aspiration for the first time conducted in the Republic of Belarus. Yield of excellent and good quality oocytes increased during aspiration during the luteal phase of estrous cycle and remained almost unchanged during aspiration into the follicular phase. Presence of follicles with diameter over 8 mm in the ovaries during aspiration reduced yield of excellent and good quality oocytes averagely by 9.4 percentage points. Removing the dominant follicle 72 hours prior to aspiration allowed increasing the number of aspirated follicles by 41 %, and yield of oocytes – by 22.9 %. Microstimulation of ovaries prior to aspiration by follicle-stimulating hormones FSG-super and Plusset increased efficiency of aspiration in terms of the main indicators by 19.2–45.9 %. Follicular cyst or persistent corpus luteum in one of the ovaries reduced both quantitative and qualitative indicators of aspiration. The data obtained are of practical importance for development of technology for in vitro embryo production in the system of transvaginal aspiration of oocytes which will help to accelerate breeding process and increase efficiency of breeding work in livestock production in general.Acknowledgments. The research was conducted within the two state research programs: “Biotechnology”, subprogram “Development of biological science, biological education and biological industry for 2007–2011 and for the period up to 2020”, “High technologies and equipment for 2016-2020”, subprogram 1 “Innovative biotechnologies–2020”.
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Ceelen, Manon y Jan P. W. Vermeiden. "Health of Human and Livestock Conceived by Assisted Reproduction". Twin Research 4, n.º 5 (1 de octubre de 2001): 412–16. http://dx.doi.org/10.1375/twin.4.5.412.

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AbstractAssisted reproduction is used to resolve infertility problems in human and in breeding programs to generate livestock. Except for gestation length and birth weight, perinatal outcome of children conceived by In Vitro Fertilization is similar to that of spontaneously conceived children. However, large offspring syndrome observed after In Vitro Production in livestock is quite alarming. The distinct parts of assisted reproduction (oocyte maturation, fertilization and culture) have been found to contribute to abnormal fetal growth and development. Genomic imprinting is suggested to be involved in the induction of the aberrant phenotypes observed after assisted reproduction. Furthermore, current knowledge on postnatal health of offspring conceived by assisted reproduction and speculations on potential longterm effects of In Vitro Fertilization will be described.
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Pohontu, Aikal, Agustinus Lomboan, Jantje F. Paath y Siane C. Rimbing. "PENAMPILAN REPRODUKSI TERNAK SAPI POTONG DI KECAMATAN BINTAUNA KABUPATEN BOLAANG MONGONDOW UTARA". ZOOTEC 38, n.º 1 (29 de diciembre de 2017): 102. http://dx.doi.org/10.35792/zot.38.1.2018.18537.

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REPRODUCTIVE PERFORMANCE OF BEEF CATTLE IN BINTAUNA DISTRICT OF NORTH BOLAANG MONGONDOW REGENCY. This study was conducted to evaluate the reproduction performance of beef cattle in Bintauna district of North Bolaang Mongondow regency. Reproductive performance was studied to determine the productivity of livestock especially in population increase and availability of meat. This research used samples of farmer as breeder of beef cattle. The selections of village samples were determined purposively by consideration of the villages with the largest population of livestock including the villages of Pimpi, Kopi, and Bintauna. Selection of respondents using random sampling method involved 10 farmers for each selected village, with the total of 30 farmers as respondents. Data of the variables were analyzed using descriptive analysis model. The results showed that the age of puberty animal was 12.03 ± 4.81 months, service per conception was 1.19, conception rate was 73%, pregnancy period was 276 ± 2.53 days, and calving interval was 366 ± 3.21 days. Based on these results, it can be concluded that the reproduction of beef cattle in Bintauna district of North Bolaang Mongondow regency was categorized into good performance. Keyword: Reproduction performance, beef cattle, Bintauna district
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Knox, R. V., M. L. Day, G. S. Lewis, M. C. Lucy y K. A. Vonnahme. "Triennial Reproduction Symposium: Challenges and opportunities facing livestock reproduction in the 21st century1". Journal of Animal Science 88, suppl_13 (1 de abril de 2010): E193—E194. http://dx.doi.org/10.2527/jas.2009-2717.

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Tesis sobre el tema "Livestock – Reproduction"

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Ferasyi, Teuku Reza. "Mathematical model of the reproductive endocrine system in male sheep". University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0080.

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[Truncated abstract] The activity of the reproductive endocrine axis is the result of interactions among many organs and tissues, particularly the hypothalamus, pituitary gland and gonad. However, it depends on more than the communication between anatomical structures because it is also affected by genotype, internal factors (e.g., metabolic inputs) and external factors (e.g., photoperiod, socio-sexual cues, stress, nutrition). This multifactorial complexity makes it difficult to use animal experimentation to investigate the pathways and mechanisms involved. Therefore, in this study, I have turned to mathematical modelling. The general hypothesis was that, by modelling the hormonal feedback loop that links the hypothalamus, pituitary gland and gonad, I would be able to discover the critical control points in this homeostatic system. This would allow me to inform and direct research into the processes that control reproduction, including inputs from environmental factors. My studies began with the development of a model of the negative feedback loop through which testosterone controls the secretion of pulses of gonadotrophin-releasing hormone (GnRH) by the hypothalamus. The model incorporated two critical factors: testosterone concentration and a time delay in the inhibition of the activity of the GnRH 'pulse generator' by testosterone. The general assumptions were: i) there are two positive feedforward processes (GnRH pulses stimulate LH pulses, and, in turn, LH pulses stimulate testosterone secretion); ii) testosterone exerts negative feedback that reduces the frequency of GnRH pulses. The model incorporated a group of equations that represent the GnRH pulse generator, through which the inhibitory effect of testosterone acted to reduce GnRH pulse frequency. Simulations were run with various values for the time delay in feedback and, as model development progressed, the simulations were extended to include combinations of time delays and levels of sensitivity of the GnRH pulse generator to inhibition by testosterone. The output of the simulations showed clearly that a time delay in negative feedback, as well as the concentration of testosterone, can greatly affect the frequency of GnRH pulses and the shape of the GnRH secretory profile. Importantly, the effect of the time delay depends on the sensitivity of the pulse generator to testosterone. In addition, the simulations suggested two additional components that might be involved in the control of the GnRH pulse generator: i) a delay in the rate of adaptation to a change in steroid feedback; and ii) a minimum pulse interval (maximum frequency). These studies iii therefore suggest that the regulation of the activity of the GnRH pulse generator, and thus the frequency and profile of GnRH and LH pulses, requires interactions among these four components. These interactions should be tested in animal experimentation. In the next stage, I extended the model so I could test whether the feedback delay might involve the process of aromatization in which testosterone is converted to oestradiol at brain level. ... This information can be used to direct future experimental studies that will help us to understand the factors that underlie the dynamic behaviour of the hypothalamic and pituitary systems that control reproduction.
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Martins, Andreia Filipa Vairinhos. "Clínica e reprodução de espécies pecuárias". Master's thesis, Universidade de Évora, 2014. http://hdl.handle.net/10174/13568.

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Neste relatório são descritas as atividades desenvolvidas durante o estágio curricular em clínica e reprodução de espécies pecuárias. Contempla ainda uma revisão bibliografia e um estudo de caso sobre os fatores que afetam a fertilidade e a avaliação da eficiência reprodutiva em ovinos. No estudo de caso procurou avaliar-se a influência da idade, da raça e da condição corporal na fertilidade de um rebanho leiteiro, em duas épocas de cobrição (estudo 1) e na sincronização de estros (estudo 2). A fertilidade do efetivo variou segundo a época de cobrição (58,2% e 55,9%, na cobrição de junho-outubro e dezembro respetivamente). A existência de animais muito jovens teve um impacto negativo na fertilidade, sendo que fertilidade apenas no efetivo adulto foi de 71,6% e 66,7%, na cobrição de junho-outubro e dezembro respetivamente. Na cobrição de junho-outubro a fertilidade foi influenciada significativamente pela idade e raça (p<0,01). A taxa de gestação após sincronização de estros não foi influenciada pela raça ou a idade (p>0,05), contudo a condição corporal teve um efeito significativo, com taxas de gestação mais elevadas nas ovelhas com melhor condição corporal; Clinical and reproduction of livestock species Abstract: This report describes the activities developed during the traineeship in clinical and reproduction of livestock species. It also includes a literature review and a case study about the factors that affect fertility and the evaluation of reproductive efficiency in sheep. This study aims to determine the influence of age, breed and body condition on fertility of a dairy herd, in two periods of mating (Study 1) and estrus synchronization (Study 2). The herd fertility varied according to the period of mating (58.2% and 55.9% in mating from June to October and December respectively) The existence of very young animals had a negative impact on fertility, wherein the fertility only in adult was 71.6% and 66.7%, in the mating from June to October and December respectively. In mating from June-October, the fertility was significantly influenced by age and breed (p <0.01). The pregnancy rate after synchronization of estrus was not influenced by breed or age (p> 0.05), however the body condition had a significant effect with higher pregnancy rates in ewes with better body condition.
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Pinto, Henrique Bessone de Sampaio Alves. "Clínica e cirurgia de espécies pecuárias". Master's thesis, Universidade de Évora, 2019. http://hdl.handle.net/10174/26578.

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O presente relatório pretende descrever as atividades desenvolvidas durante o estágio curricular inerente ao Mestrado Integrado em Medicina Veterinária na Universidade de Évora. O estágio foi dividido em duas etapas, a primeira foi realizada na Associação dos Jovens Agricultores Micaelenses – Cooperativa Juventude Agrícola, e a segunda no Hospital Veterinário Muralha de Évora. Foi realizado um estudo preliminar com o tema “Plasmoterapia em vitelos com falha na transferência de imunidade passiva na região do Alentejo”, no qual se estudou a transfusão de plasma híperimune, como adjuvante do tratamento de neonatos com falha na transferência de imunidade passiva, correlacionando a plasmoterapia com o aumento da concentração sérica de imunoglobulinas dos vitelos. Através do presente estudo concluiu-se a necessidade da posterior aplicação do presente protocolo de plasmoterapia em mais neonatos, de forma a entender melhor os benefícios da plasmoterapia em vitelos na região do Alentejo; Large Animal Clinics and Surgery Abstract: This report describes the activities developed during the internship inherent to the Master in Veterinary Medicine at the University of Évora. The internship was divided into two stages, the first was held at the “Associação dos Jovens Agricultores Micaelenses – Cooperativa Juventude Agrícola” and the second at the “Hospital Veterinário Muralha de Évora”. A preliminary study regarding the administration of hyperimmune plasma as an adjunct in the treatment of neonates with failure of passive transfer was performed. This study aimed to reduce the neonatal death in a farm, correlating the plasma therapy with the increase of serum immunoglobulin levels in calves. Through the present study, more research is required in order to better understand the benefits of plasma therapy in calves in the Alentejo region.
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Silva, Maria Madalena Afonso Cannas Henriques da. "Clínica e cirurgia de animais de companhia". Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/23500.

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O presente relatório pretende descrever as atividades desenvolvidas no âmbito do estágio curricular do Mestrado Integrado de Medicina Veterinária da Universidade de Évora, na área de clínica e cirurgia de espécies pecuárias. O trabalho foi dividido em duas partes, a primeira apre-senta uma descrição das atividades acompanhadas durante o estágio, nas diferentes áreas relacionadas com a produção pecuária, tais como, sanidade e profilaxia, clínica médica e cirúrgica e controlo reprodutivo. A segunda parte do trabalho consiste numa revisão bibliográfica sobre a distócia em bovinos e apresentação dos dados dos casos clínicos assistidos. A distócia é uma afeção com grande importância na produção pecuária devido ao seu impacto económico numa exploração. O conhecimento dos mecanismos fisiológicos do parto e dos fatores predisponentes à distócia, permite identificar situações de risco e agir de forma a prevenir a distócia numa exploração; ABSTRACT: Large Animals Clinic and Surgery The following report describes the work developed throughout the curricular internship which is part of the Integrated Master in Veterinary Medicine of the University of Évora, and it takes on a particular attention to the large animal surgery and clinics sector. It has been organized in two parts. The first part describes the supervised activities during the internship in the different areas related to livestock production, such as disease control programs and prophylaxis, medical and surgical clinic, and reproductive assistance. The latter part of the report consists on a bibliographical re-view on the dystocia in cattle and data presentation regarding the clinical cases. Dystocia has a significant influence on livestock production due to its economic impact on a herd. The knowledge of parturition’s physiological mechanisms and predisposing factors to dystocia, promotes the ca-pacity to identify risky cases and to act in a way to prevent dystocia on a herd.
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Schmoeller, Ruminiki Pavei. "Implementação em software de um modelo de avaliação da eficiência reprodutiva de rebanhos leiteiros como instrumento para a tomada de decisão". Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2198.

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Este trabalho faz um estudo em propriedades leiteiras no oeste do Paraná com objetivo de (1) formar um entendimento sobre as características sociais, econômicas, gerencias e tecnológicas presentes nas propriedades; (2) implementar em software um modelo de avaliação da eficiência reprodutiva de rebanhos leiteiros e (3) avaliar a aceitação dos produtores ao uso do software. Para isso foi realizada pesquisa quantitativa descritiva com 100 produtores de Medianeira, São Miguel do Iguaçu e Serranópolis do Iguaçu, no oeste do estado, buscando, com base na análise estatística, identificar, entre outros, os padrões para a prática da escrituração zootécnica e uso da tecnologia da informação. Os resultados mostraram que 90% dos produtores mantém algum nível de controle zootécnico, no entanto 72% não avaliam qualquer indicador de desempenho. Entre os produtores que mantém algum controle zootécnico, 87% o fazem em papel. Em média, 74% dos produtores desconhece a margem de lucro da atividade. Tanto no controle de custos, quanto no controle zootécnico e uso de sistemas de informação, não foram identificadas diferenças significativas no comportamento de produtores mais jovens. O software desenvolvido foi utilizado durante dez meses em uma propriedade leiteira com 150 animais da raça holandesa, sendo atualizado semanalmente com os eventos reprodutivos do rebanho. Com o uso do modelo pôde-se analisar 68% dos animais do rebanho (100% dos animais em estágio reprodutivo), uma abrangência quatro vezes maior do que a obtida por meio da fórmula de cálculo do intervalo entre partos (IEP). Foram realizados treinamentos com dois grupos de produtores de diferentes faixas etárias para avaliação da aceitação do software com ênfase nos construtos de expectativa de desempenho, expectativa de esforço, atitude para o uso, condições facilitadoras, autoeficácia e ansiedade frente ao uso do sistema. Em relação a aceitação do software, a expectativa de desempenho (utilidade) foi o aspecto mais bem avaliado pelos produtores. A autoeficácia foi o aspecto de menor percepção, demonstrando maior preocupação dos produtores com possíveis dificuldades que poderiam enfrentar durante o uso.
This work does a study on dairy farms in western Parana in order to (1) form an understanding of the social, economic, managerial and technological characteristics present in the property; (2) implement in software an evaluation model of reproductive efficiency of dairy herds and (3) evaluate the acceptance of the producers to the use of software. For it was carried out a descriptive quantitative research with 100 producers of Medianeira, São Miguel do Iguaçu and Serranópolis do Iguaçu, in the western state, seeking, based on statistical analysis, identify, among others, the practice of zoo technical bookkeeping and use of information technology.. The results showed that 90% of manufacturers stated maintain some level of control livestock, however 72% do not evaluate any performance indicator. Among the producers who keeps some livestock control, 87% they do it on paper. On average, 74% of farmers unaware of the profit margin of the activity. Both in cost control, as the livestock control and use of information systems, no significant differences were identified in the behavior of younger producers. The software developed was used for ten months in a dairy property with 150 Holstein animals race, being updated weekly with the reproductive herd events. With the use of the model can analyze 68% of herd animals (100% of the animals at reproductive stage) an extent four times greater than the range obtained by calculation formula calving interval. Training was conducted with two groups of producers of different age groups to evaluate the acceptance of the software with an emphasis on performance expectation constructs, of performance, effort expectancy, attitude for the use, facilitating conditions, self-efficacy and anxiety during use of the system. Regarding the software acceptance, the performance expectations (utility) was the aspect best rated by the producers. The self-efficacy was the appearance of lower perception, showing greater concern for producers with possible difficulties that could face during the use.
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Kluska, Sabrina. "Análise de características reprodutivas, tratadas como variáveis categóricas, em bovinos da raça Nelore". Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2477.

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O presente trabalho teve como objetivo estimar parâmetros genéticos, em uma população de bovinos da raça Nelore, para as características probabilidade de parto até os 39 meses de idade (PC39), probabilidade de permanência no rebanho (stayability), considerando três partos até 5,2 (STAY5,2) e três partos até 6,2 anos (STAY6,2), e os quatro primeiros intervalos entre partos (IEP1, IEP2, IEP3 e IEP4), tratando- as como variáveis categóricas, e para os perímetros escrotais à desmama (PED) e ao sobreano (PES), tratando-as como variáveis contínuas. Foram usados procedimentos bayesianos, em análises unicaracterística e bicaracterística, por meio dos programas THRGIBBS1F90 e GIBBS2F90. Os dados utilizados pertencem ao programa de melhoramento genético Geneplus - Embrapa. As herdabilidades para PC39, STAY5,2, STAY6,2 , PED e PES em análise unicaracterística foram 0,15, 0,20, 0,23, 0,28 e 0,36, respectivamente. Para o intervalo entre partos as estimativas de herdabilidade, obtidas em análise unicaracterística, para IEP1, IEP2, IEP3 e IEP4 foram 0,13 0,13, 0,12 e 0,17, respectivamente. Estes valores indicam que os ganhos por seleção direta em quaisquer um dos intervalos seriam pequenos.Na análise bicaracterística as herdabilidades para PC39 e PES foram 0,14 e 0,38,respectivamente. As estimativas obtidas foram de baixa magnitude, indicando que os ganhos por seleção direta em qualquer uma das características mensuradas nas fêmeas seriam baixos. Já o PED e PES apresentaram maiores valores de herdabilidades. A correlação entre PES e PC39 foi positiva e de baixa magnitude (0,25), sugerindo que a seleção para o aumento do PES de touros possivelmente levaria a pequenas mudanças na PC39. De modo geral as estimativas de herdabilidade para as características medidas nas fêmeas apresentaram baixos valores, enquanto que para as características medidas nos machos se apresentaram de moderada a baixa, de maneira semelhante à maioria dos estudos com estas características. Entretanto, o modelo de limiar foi capaz de detectar variância genética aditiva para as características em estudo, permitindo promover ganhos, embora pequenos, por seleção direta.
In the present study were obtained, in a population of Nellore cattle, estimates of genetic parameters for the characteristics probability of calving up to 39 months at age (PC39), stayability, considering three calving until 5.2 (STAY5,2) and trhee calving until 6.2 years old (STAY6,2), and the first four calving interval (CI1, CI2, CI3 and CI4), treated as categorical traits, and scrotal perimeter at weaning (EPD) and at 18 months of age (EPS), treated as continuos trait. Were used Baeysian procedures, in single and two trait analysis, by using THRGIBBS1F90 and GIBBS2F90 programs. Information from Nellore animals belonging to the Geneplus-Embrapa program was used. The heritabilities for PC39, STAY3,1, STAY3,2, EPD and EPS in single trait analysis were 0.14, 0.20, 0.23, 0.28 and 0.36, respectively. For the calving interval estimates heritabilities for CI1, CI2, CI3 and CI4 were 0.13, 0.13, 0.12 and 0.017, respectively. These values indicate that genetic gains by direct selection in any of the intervals would be very small. In the two trait analysis the heritabilities for PC39 and EPS were 0.15 and 0.38, respectively. The low values of estimates showed that small gains would be obtained by direct selection in any of traits measured in females. EPD and EPS had higher heritabilities. The correlation between EPS and PC39 was positive with low magnitude (0.25), suggesting that the selection for the increase of EPS of sires could possibly lead to small changes in the PC39. In general, estimates of heritability for traits measured in dams were low and for traits measured in males were moderate to low. This result is likely those reported in most studies with the same traits. However, the threshold model was able to detect additive genetic variance for the traits under study and can permit to promote gains, albeit small, by direct selection.
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Starbuck, Melanie J. "Factors affecting reproductive efficiency of cattle". Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4301.

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Thesis (Ph. D.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains ix, 150 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 116-149).
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Sorensen, George Edwin Peter. "Host-virus interactions in porcine reproductive and respiratory syndrome virus infection". Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/10040.

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Porcine reproductive and respiratory syndrome virus (PRRSV) is a rapidly evolving virus that has significant economic and welfare implications for the pig industry. Vaccination strategies have proved largely ineffective in controlling PRRSV, in some cases even reverting to virulence. An increasing body of evidence suggests a host genetic basis for PRRSV resistance so there is a need to examine the role of host genetics in a biologically relevant in vitro cell culture system. However, PRRSV research is inhibited by the current scarcity of suitable in vitro culture systems. With the aim of developing a convenient in vitro model, porcine bone marrow-derived macrophages (BMDM) were evaluated as a PRRSV cell culture system. BMDM were found to be highly permissive to Type I PRRSV and amenable to genetic manipulation. BMDM proved to be excellent cells for virus production, producing significantly higher titres of PRRSV than commonly used alternative cell types. Surprisingly, PRRSV entry into BMDM was found to be independent of both the prototypic PRRSV receptors, CD163 and CD169, providing further evidence for the existence of alternate PRRSV entry mechanisms in primary cell types. To explore the genetics of pig susceptibility to PRRSV, network-based analysis of host transcriptional datasets, following PRRSV challenge, revealed important differences in co-regulated gene pathways between samples from pigs with different PRRSV-permissiveness. These pathways included genes with important, recently characterised, anti-pathogen activities. The incorporation of network-based transcriptional analysis and published genetic variation data led to the identification of a member of the guanlyate binding protein family, GBP-1, as a candidate host gene involved in controlling PRRSV replication. Overexpression of GBP-1 in BMDM revealed a significant anti-PRRSV function for this protein. Further investigation of published genetic variation in GBP-1 suggested a potential role of this gene in PRRSV tolerance. The results presented in this thesis provide evidence for an alternate PRRSV entry pathway in a biologically relevant cell type. The discovery of a highly PRRSV-infectable cell type with potential for genetic manipulation adds a useful new tool to the area of PRRSV research. The identification of GBP-1 as a novel anti-viral protein with a significant inhibitory effect on PRRSV infection, together with genetic variation in this gene, prompts further research into the genetic basis for PRRSV resistance.
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Alarcón, Caballero Rocio Anali, Yllatopa Frank Bazalar, Velarde Bryan Fabricio Meneses, Basilio Isabel Ventura Soto y Navarro Victor Enrique Urrutia. "Proyecto de aplicativo móvil EQUIVAPP". Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/656953.

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En el presente trabajo, se presentará el desarrollo del prototipo del aplicativo móvil EQUIVAPP, el cual busca conectar personas que laboran dentro de la industria ganadera y equina, facilitando de esta manera la comunicación con una cartera de clientes y servicios especializados en el sector, otorgando un nivel alto de confianza mediante la oferta de una gran variedad de productos valorados y puntuados por los mismos usuarios. En otras palabras, lograr posicionarnos dentro de los clientes como un aplicativo que les ayuda ahorrar tiempo y pérdidas por contar con un gran número de posibles socios con valoraciones que les aseguran una calidad premium de los servicios que requiere. Asimismo, estarán presentes, dentro del aplicativo, todos los servicios que quieran acceder que estén dentro de reproducción, transporte, venta de alimentos balanceados o especiales y veterinaria. La elaboración de este proyecto está centrada en acabar con el gran nivel de pérdidas registradas dentro del sector, puesto que la gran mayoría de contactos que poseen muchas de las empresas son obtenidas por recomendaciones de vecinos o trabajadores aledaños. Asimismo, la implementación de tecnología dentro de un sector rural no es un gran problema, puesto que la mayoría de las familias dedicadas a este sector, cuentan con las nuevas generaciones que vienen actualizadas con el manejo de celulares, computadoras, laptops y demás dispositivos tecnológicos.
In this paper, we will present the development of the prototype of the mobile application EQUIVAPP, which seeks to connect people working in the livestock and equine industry, thus facilitating communication with a portfolio of customers and specialized services in the sector, providing a high level of confidence by offering a variety of products valued and rated by the same users. In other words, to position ourselves within the customers as an application that helps them save time and losses by having a large number of potential partners with ratings that will ensure a premium quality of the services required. Likewise, all the services they want to access in the areas of reproduction, transport, sale of balanced or special feed and veterinary services will be present in the application. The development of this project is focused on putting an end to the high level of losses registered within the sector, since most of the contacts that many of the companies have are obtained through recommendations from neighbors or neighboring workers. Likewise, the implementation of technology in a rural sector is not a big problem, since most of the families dedicated to this sector have new generations that are up to date with the use of cell phones, computers, laptops and other technological devices.
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Gates, Peter J. "Analyzing categorical traits in domestic animal data collected in the field /". Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5473-5.pdf.

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Libros sobre el tema "Livestock – Reproduction"

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Bearden, H. Joe. Applied animal reproduction. 6a ed. Upper Saddle River, N.J: Prentice Hall, 2004.

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Bearden, H. Joe. Applied animal reproduction. 5a ed. Upper Saddle River, N.J: Prentice Hall, 2000.

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W, Fuquay John, ed. Applied animal reproduction. 4a ed. Upper Saddle River, N.J: Prentice Hall, 1997.

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Gordon, Ian R. Reproductive technologies in farm animals. Wallingford, Oxfordshire: CABI Pub., 2004.

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Egyptian Society for Animal Reproduction and Fertility. Annual Congress. Proceedings of the First Annual Congress, Egyptian Society for Animal Reproduction and Fertility, held in Fac. Vet. Med. Alex. Univ., Edfina, 24-26 January, 1989, Egypt. Editado por Abdou M. S. S. [Cairo?: Egyptian Society for Animal Reproduction and Fertility?, 1989.

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Bearden, H. Joe. Applied animal reproduction. 3a ed. Englewood Cliffs, N.J: Prentice Hall, 1992.

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Hafez, E. S. E. 1922-, ed. Reproduction in farm animals. 5a ed. Philadelphia: Lea & Febiger, 1987.

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Bhatta, Raghavendra, K. T. Sampath y Jyotirmoy Ghosh. Animal nutrition & reproductive physiology: Recent concepts. New Delhi: Satish Serial Publishing House, 2013.

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International Congress on Animal Reproduction (12th 1992 The Hague, Netherlands). Clinicaltrends and basic research in animal reproduction: Proceedings of the 12th International Congress on Animal Reproduction, The Hague, Netherlands, 23-27 August, 1992. Amsterdam: Elsevier, 1992.

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Noakes, David E. Veterinary reproduction and obstetrics. 9a ed. Edinburgh: Saunders, 2009.

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Capítulos de libros sobre el tema "Livestock – Reproduction"

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Naqvi, S. M. K., Davendra Kumar, Rajani Kr Paul y Veerasamy Sejian. "Environmental Stresses and Livestock Reproduction". En Environmental Stress and Amelioration in Livestock Production, 97–128. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29205-7_5.

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Boiti, Cristiano, Cesare Castellini, Pascale Chavatte-Palmer, Peter Chrenek, Bernd Fischer y Adriana Kolesárová. "Biology of reproduction and reproduction technologies in the rabbit." En The genetics and genomics of the rabbit, 197–211. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781780643342.0011.

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Abstract This chapter presents the recent advancements acquired in the field of biology and technology of reproduction that may have significant repercussions in the breeding of rabbits as livestock and as laboratory animals.
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Qamar, Ahmad Yar, Aman Ullah Khan, Aatka Jamil y Muhammad Abubakar. "Biotechnology and Animal Reproduction". En The Role of Biotechnology in Improvement of Livestock, 1–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46789-3_1.

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Singh, Birbal, Gorakh Mal, Sanjeev K. Gautam y Manishi Mukesh. "Revolutionary Reproduction Biotechnologies in Livestock: An Overview". En Advances in Animal Biotechnology, 83–96. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-21309-1_8.

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Blom, J. Y., J. M. Christensen y C. Ridder. "7.1. Real-time analyses of BHB in milk can monitor ketosis and its impact on reproduction in dairy cows". En Precision livestock farming applications, 263–72. The Netherlands: Wageningen Academic Publishers, 2015. http://dx.doi.org/10.3920/978-90-8686-815-5_30.

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Blom, J. Y., J. M. Christensen y C. Ridder. "7.1. Real-time analyses of BHB in milk can monitor ketosis and its impact on reproduction in dairy cows". En Precision livestock farming applications, 263–72. The Netherlands: Wageningen Academic Publishers, 2015. http://dx.doi.org/10.3920/978-90-8686-815-5_7.1.

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Gaughan, John y A. J. Cawdell-Smith. "Impact of Climate Change on Livestock Production and Reproduction". En Climate Change Impact on Livestock: Adaptation and Mitigation, 51–60. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2265-1_4.

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Chandra, Vikash, Veerasamy Sejian y G. Taru Sharma. "Strategies to Improve Livestock Reproduction Under the Changing Climate Scenario". En Climate Change Impact on Livestock: Adaptation and Mitigation, 425–39. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2265-1_24.

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Stott, Alistair y Bouda Vosough Ahmadi. "Farm animal welfare: the future." En The economics of farm animal welfare: theory, evidence and policy, 173–90. Wallingford: CABI, 2020. http://dx.doi.org/10.1079/9781786392312.0173.

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Abstract Science can help us understand what animals want and economics can provide the understanding of human motivation needed to deliver such wants. In our view, what needs further development in future is for economics and information/communication science and technology to channel awareness into appropriate action. This chapter elaborates on this idea by providing some illustrative examples. Focusing on animal health and welfare, it argues that there is much scope for improvement in profit and welfare on commercial farms simply by adopting the best disease management approach available. We also emphasize the importance of systems modelling and operations research (OR) in the future to ensure that animal welfare taps into the growing opportunities that developments in these methods are likely to bring. The chapter also argues that OR can provide a bridge between animal welfare science, economics and business to deliver improvements in animal welfare through food markets. The importance of big data and precision livestock farming in livestock production/reproduction, animal health and welfare, and the environmental impact of livestock production are also discussed. New genetic approaches to optimize livestock resilience and efficiency are highlighted. We argue that tackling difficult problems, such as sustainability (that encompasses animal welfare alongside environment and climate change), efficiency and resilience in farm animal production systems, is and will remain a vital focus of research in the agri-food sector. Research methods and governance still need to change to properly reflect this. It is envisaged that animal welfare will be affected by these developments and should, wherever appropriate, be explicitly considered.
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Wolfenson, David y William W. Thatcher. "Strategies for Improvement of Thermal and Reproductive Responses under Heat Stress". En Environmental Physiology of Livestock, 181–98. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781119949091.ch10.

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Actas de conferencias sobre el tema "Livestock – Reproduction"

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Hideo Minagawa, Yasuhiro Tozawa, Hiroshi Noziki, Ayumi Nakatsubo y Katsuyuki Tanaka. "A Technical Development of Reproduction of Resources from Animal and Plant Wastes for Sustainable Agriculture". En Livestock Environment VIII, 31 August - 4 September 2008, Iguassu Falls, Brazil. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2008. http://dx.doi.org/10.13031/2013.25632.

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Gómez-Bonilla, Yannery. "Monitoring and reproduction of Stomoxys calcitransin stubble pineapple, banana, palm oil, and livestock in Costa Rica". En 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.109006.

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TRUKHACHEV, Vladimir, Sergey OLEYNIK, Nikolay ZLYDNEV y Vitaliy MOROZOV. "SCREENING OF COMPLEX VERTEBRAL MALFORMATION (CVM) AND BOVINE LEUKOCYTE ADHESION DEFICIENCY (BLAD) IN THE AYRSHIRE CATTLE BREED IN THE NORTH CAUCASUS". En RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.142.

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The Ayrshire dairy breed is renowned for producing large quantities of high quality milk and, therefore, is frequently used for crossbreeding. However, various hereditary anomalies caused by gene mutations have been recently recorded in calves produced by some Ayrshire sires. Most of these anomalies were shown to have a recessive inheritance pattern, thus imposing a threat of unpredictable dramatic changes in cattle genotypes under such factors as genetic drift, selection and inbreeding. The purpose of this study was to examine the susceptibility of the Ayrshire cattle bred in the North Caucasus to such hereditary abnormalities as complex vertebral malformation (CVM) and bovine leukocyte adhesion deficiency (BLAD). The investigation was carried out on 16 cows with various phenotype and reproduction disorders that were selected based on a three-year veterinary observation of 440 livestock animals. The target group cows were generally the descendants of Hannulan Yaskiyri, Riihiviidan Urho Errant and O.R. Lihting. The results demonstrated that no animals under study were the carriers of these genetic disorders, which proved the mutant alleles of BLAD and CVM to be absent from the Ayrshire cattle livestock bred in the North Caucasus. Therefore, the sires of these cattle can be successfully used for breeding.
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Lopes, S. I., R. Bexiga, J. P. Araújo, J. L. Cerqueira, C. Abreu, C. Paredes y J. M. Alonso. "90. Precision livestock farming for reproductive performance optimization: a survey". En 13th Congress of the European Society for Agricultural and Food Ethics. The Netherlands: Wageningen Academic Publishers, 2016. http://dx.doi.org/10.3920/978-90-8686-834-6_90.

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Glogerley Tatiana Sales, Elias Tadeu Fialho, Tadayuki Yanagi Junior, Rilke T. Fonseca de Freitas, Vitor Hugo Teixeira, Richard S Gates y George B Day. "Thermal Environment Influence on Swine Reproductive Performance". En Livestock Environment VIII, 31 August - 4 September 2008, Iguassu Falls, Brazil. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2008. http://dx.doi.org/10.13031/2013.25582.

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La, Amy, Qiang Zhang, David Levin y Kevin Coombs. "Effectiveness of Negative Air Ionization in Removing Airborne Porcine Reproductive and Respiratory Syndrome Virus (PRRSV)". En 10th International Livestock Environment Symposium (ILES X). St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2018. http://dx.doi.org/10.13031/iles.18-070.

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P A Eichen, M C Lucy, T J Safranski, E A Coate, A M Williams y D E Spiers. "Heat Stress Effects on Sow Reproductive Performance Using Simulated Forced Air and Evaporative Cooling Systems". En Livestock Environment VIII, 31 August - 4 September 2008, Iguassu Falls, Brazil. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2008. http://dx.doi.org/10.13031/2013.25583.

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Azhar, H., M. Zamri Saad, F. FA Jesse y S. Annas. "Retrospective Study on Milk Production and Reproductive Performance of Dairy Cattle in a Farm in Selangor, Malaysia". En Proceedings of International Seminar on Livestock Production and Veterinary Technology. Indonesian Center for Animal Research and Development (ICARD), 2016. http://dx.doi.org/10.14334/proc.intsem.lpvt-2016-p.157-162.

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Praharani, Lisa, Supriyati Supriyati y Rantan Krisnan. "A Preliminary Study on Some Reproductive Traits and Heterosis Effects of Anglo Nubian and Etawah Grade Crossbred Does". En Proceedings of International Seminar on Livestock Production and Veterinary Technology. Indonesian Center for Animal Research and Development (ICARD), 2016. http://dx.doi.org/10.14334/proc.intsem.lpvt-2016-p.252-260.

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