Hereford Cattle
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Impact of embryo transfer phenotypic records on large-scale beef cattle genetic evaluations
ABSTRACT We aimed to evaluate the impact of using embryo transfer (ET) information on weaning weight estimated breeding values (EBV) and its accuracy. Data from Hereford and Braford cattle, raised under extensive conditions in Southern Brazil, were used. A model that included ET information in addition to maternal (genetic and permanent environmental) effect
R. Bras. Zootec.. Publicado em: 18/06/2018
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2. Métodos multivariados para agrupamento de bovinos de raça Hereford em função dos parâmetros de curvas de crescimento / Multivariate methods for grouping Hereford cattle breed against the parameters of growth curves
Após o ajuste individual das 55 vacas estudadas pelo modelo Gompertz difá- sico com estrutura de erros autorregressiva de ordem 1 (totalizando 7 parâmetros), notou-se que apenas 6 vacas tinham problemas nas estimativas de seus parâmetros (não convergentes ou não signicativos), dessa forma continuou-se o trabalho proposto com 49 animais. Com as estimati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/01/2012
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3. Sincronização do estro em bovinos Hereford-Angus com crestar.
1997
Revista brasileira de reprodução animal. Publicado em: 2011
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4. Reproductive deficiency in bulls from synthetic breeds according to the type of crossbreed and the morphology of the Y chromosome
We used 550 Braford and 214 Brangus-lbagé bulls to study the association between Y chromosome morphology and the evaluation of breeding-soundness, karyotyping and breeding records were used to assess Y chromosome morphology. In general, no direct association was detected between the individual type of Y chromosome and reproductive fitness as previously esti
Publicado em: 2010
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5. Heterozigose individual e materna sobre o ganho de peso do nascimento ao desmame de terneiros pampiano-bradford / Individual and maternal heterozigosis on preweaning weigth gain of pampaiano – braford calves
Foram analisados dados de ganho de peso do nascimento ao desmame (GNDa) de animais Pampiano-Braford (cruzamento de Nelore X Hereford) criados no Rio Grande do Sul com a finalidade de verificar a influência da heterose individual (HI) e materna (HM) sobre o GNDa e quantificá-la. Os dados foram pré-ajustados para idade da vaca (IV), data juliana de nascimen
Publicado em: 2010
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6. Períodos de parição e taxa de prenhez em vacas de corte / Calving periods and pregnancy rate in beef cattle
O presente trabalho contextualiza a importância dos efeitos do histograma de partos (HP) e da subépoca de parição (SP) sobre o desempenho reprodutivo de vacas de corte. O primeiro trabalho avaliou o efeito do histograma de parição sobre a taxa de prenhez (TP) de 1.314 vacas de corte primíparas e 4.519 multíparas Hereford em campo nativo de uma criaç
Publicado em: 2008
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7. Estudos de fatores ambientais e genéticos que interferem no ganho pré e pós-desmame e estimativas de parâmetros e tendência genética para um rebanho da raça Hereford / Study of environmental factors affecting pre weaning and post weaning gain estimates of genetic parameters and tendencies in one hereford cattle herd
Foram realizadas análises dos fatores ambientais e genéticos que influenciavam o ganho médio diário pré-desmame (GMDPRE) e ganho médio diário pós-desmame (GMDPOS) de um rebanho da raça Hereford criado no Rio Grande do Sul. Com base nos resultados obtidos por meio de quadrados mínimos, os principais fatores ambientais fixos foram ano e época de nas
Publicado em: 2007
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8. Association of CAPN1 and CAST gene polymorphisms with meat tenderness in Bos taurus beef cattle from Argentina
The activity of the calpains/calpastatin proteolytic system is closely related to the postmortem tenderization of meat. We investigated the association between beef tenderness and single nucleotide polymorphism (SNP) markers on the CAPN1 gene (SNP316, alleles C/G; SNP530 alleles A/G) and the CAST gene 3' untranslated region (SNP2870, alleles A/G). We sampled
Genetics and Molecular Biology. Publicado em: 2007
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9. Effects of cytoplasmic inheritance on preweaning traits of Hereford cattle
The influence of cytoplasmic inheritance on birth and weaning weight was evaluated in an experimental Hereford herd. Data on 1,720 records for birth and weaning weights from calves born between 1963 and 2002 were studied. Variance components were estimated using MTDFREML procedures and an animal model was fitted for each trait. Direct and maternal additive e
Genetics and Molecular Biology. Publicado em: 2005-09
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10. Perfil fenotípico de linfócitos periféricos de bovinos de raças européias
The phenotypic profile of bovine lymphocytes was evaluated in 18 bovines (Bos taurus) from three different breeds, being nine Holstein, six Hereford, and three Brown Swiss. All animals were free from ticks and hemoparasites, as determined after jugular vein blood sampling. The immunophenotypes of peripheral lymphocytes were evaluated by flow cytometry. Perip
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Publicado em: 2004-02
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11. A Genetic Investigation of Allometric Growth in Hereford Cattle
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12. Comparisons of ruminal fermentation characteristics and microbial populations in bison and cattle.
Ruminal microbial populations, fermentation characteristics, digestibility, and liquid flow rates in two ruminally cannulated bison and two ruminally cannulated Hereford steers fed a prairie hay diet were compared. No significant differences in anaerobic bacterial counts, volatile fatty acid concentrations, or ruminal pHs were evident between bison and cattl