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Registros recuperados: 8
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Associação genética entre características reprodutivas e lineares de tipo da raça Holandesa no Brasil. Repositório Alice
ALMEIDA, T. P. de; KERN, E. L.; COBUCI, J. A.; COSTA, C. N..
Tipo: Separatas Palavras-chave: Idade ao primeiro parto; Bovinos leiteiros; Textura do úbere.; Eficiência Reprodutiva; Intervalo de Parto..
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1009346
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Estimates of genetic and crossbreeding parameters for 305-day milk yield of Girolando cows. Repositório Alice
DALTRO, D. dos S.; SILVA, M. V. G. B.; GAMA, L. T. da; MACHADO, J. D.; KERN, E. L.; CAMPOS, G. S.; PANETTO, J. C. do C.; COBUCI, J. A..
The objective of this work was to evaluate the effects of breed and heterosis on the estimates of genetic parameters of 305-day milk yield (305MY), by fitting milk yield data to the Wood, Mixed Log, Morgan, and Wilmink non-linear models. A total of 258,891 test-day milk yield records of 37,965 Holstein (H), Gyr (G), and Girolando (1/2 H, 1/4 H, 3/4 H, 3/8 H, 5/8H and 7/8H genetic groups) cows from 1840 herds were collected in the state of Minas Gerais, Brazil, in the period of 1998 to 2014. The pedigree file included 36,640 animals, 3677 bulls and 24,472 cows. The genetic parameters were obtained by one-character analysis using the AIREMLF90 software. The heritability estimates of 305MY, and of 305MY fitted to the different nonlinear models ranged from...
Tipo: Artigo de periódico Palavras-chave: Heterose; Vaca Leiteira; Gado Leiteiro; Modelo Matemático; Bovino; Dairy cows; Heritability; Heterosis; Mathematical models.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133496
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Genetic association between herd survival and linear type traits in Holstein cows under tropical conditions. Repositório Alice
KERN, E. L.; COBUCI, J. A.; COSTA, C. N.; MCMANUS, C. M.; CAMPOS, G. S.; ALMEIDA, T. P.; CAMPOS, R. V..
Tipo: Separatas Palavras-chave: Linear type traits; Bayesian method.; Dairy cattle; Genetic correlation; Longevity..
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1010568
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Genetic association between longevity and linear type traits of Holstein cows. Repositório Alice
KERN, E. L.; COBUCI, J. A.; COSTA, C. N.; MCMANUS, C. M.; BRACCINI NETO, J..
Longevity is a desirable trait in the dairy industry because of its relationship to profitability. The aim of this study was to estimate genetic parameters for longevity measurements related to productive life, or life in the herd, and linear type traits of Brazilian Holstein cows born between the years 1990 and 2008. The (co) variance components were estimated by the restricted maximum likelihood method. The heritability for measurements of longevity and linear type traits ranged from 0.05 to 0.07 and 0.08 to 0.39, respectively. The genetic correlations between measurements of longevity and linear type traits ranged from -0.39 to 0.31. Direct selection for longevity does not necessarily lead to long-lived cows, due to low heritability. Indirect genetic...
Tipo: Separatas Palavras-chave: Mammary system; Productive life; Rear teat placement.; Genetic correlation..
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1033243
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Genetic parameters for linear type traits and milk, fat, and protein production in holstein cows in Brazil. Repositório Alice
CAMPOS, R. V.; COBUCI, J. A.; KERN, E. L.; COSTA, C. N.; McMANUS, C. M..
The objective of this study was to estimate genetic and phenotypic parameters for linear type traits, as well as milk yield (MY), fat yield (FY) and protein yield (PY) in 18,831 Holstein cows reared in 495 herds in Brazil. Restricted maximum likelihood with a bivariate model was used for estimation genetic parameters, including fixed effects of herd-year of classification, period of classification, classifier and stage of lactation for linear type traits and herd-year of calving, season of calving and lactation order effects for production traits. The age of cow at calving was fitted as a covariate (with linear and quadratic terms), common to both models. Heritability estimates varied from 0.09 to 0.38 for linear type traits and from 0.17 to 0.24 for...
Tipo: Separatas Palavras-chave: Functional Trait; Selection.; Dairy cattle; Genetic correlation; Heritability..
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1033399
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Heterose nos componentes da curva de lactação de animais da raça Girolando. Repositório Alice
DALTRO, D. dos S.; KERN, E. L.; MACHADO, J. D.; PADILHA, A. H.; SILVA, M. V. G. B.; PANETTO, J. C. do C.; COBUCI, J. A..
Tipo: Separatas Palavras-chave: Modelos matemáticos; Pico de lactação; Produção de leite; Tempo ao pico.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1072286
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Parâmetros genéticos para características reprodutivas em vacas da raça Holandesa. Repositório Alice
ALMEIDA, T. P. de; KERN, E. L.; COBUCI, J. A.; COSTA, C. N.; BRACCINI NETO, J..
Tipo: Separatas Palavras-chave: Idade ao primeiro parto; Período seco; Duração da lactação; Período de serviço.; Intervalo de Parto..
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1008579
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Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model. Repositório Alice
KERN, E. L.; COBUCI, J. A.; COSTA, C. N.; DUCROCQ, V..
ABSTRACT: Longevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise Weibull proportional hazard model. Three analyses were performed i) productive life was corrected for within herd level of production as a proxy for functional longevity, which included the time-dependent effects of region within year, class of milk production within herdyear, milk production class within lactation number, fat class and protein contents within herd and (variation in) herd size as well as the time-independent fixed effect of age at first...
Tipo: Separatas Palavras-chave: Conformation traits; Culling risk; Survival analysis; Dairy cattle; Longevity.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103810
Registros recuperados: 8
Primeira ... 1 ... Última
 

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