Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Genet. Mol. Biol. (2) Autor Cobuci,Jaime Araujo (2) Costa,Claudio Napolis (2) Euclydes,Ricardo Frederico (2) Lopes,Paulo Sávio (2) Pereira,Carmen Silva (2) Torres,Robledo de Almeida (2) Mais... Palavra-chave Random regression models (2) Genetic evaluation (1) Genetic parameters (1) Holstein cows (1) Persistency of lactation (1) REML method (1) Rank correlation (1) Test-day milk yield (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2007 (1) 2005 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Estimation of genetic parameters for test-day milk yield in Holstein cows using a random regression model Genet. Mol. Biol. Cobuci,Jaime Araujo; Euclydes,Ricardo Frederico; Lopes,Paulo Sávio; Costa,Claudio Napolis; Torres,Robledo de Almeida; Pereira,Carmen Silva. Test-day milk yield records of 11,023 first-parity Holstein cows were used to estimate genetic parameters for milk yield during different lactation periods. (Co)variance components were estimated using two random regression models, RRM1 and RRM2, and the restricted maximum likelihood method, compared by the likelihood ratio test. Additive genetic variances determined by RRM1 and additive genetic and permanent environmental variances estimated by RRM2 were described, using the Wilmink function. Residual variance was constant throughout lactation for the two models. The heritability estimates obtained by RRM1 (0.34 to 0.56) were higher than those obtained by RRM2 (0.15 to 0.31). Due to the high heritability estimates for milk yield throughout lactation and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Random regression models; REML method; Genetic parameters; Test-day milk yield; Holstein cows. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100013 Genetic evaluation for persistency of lactation in Holstein cows using a random regression model Genet. Mol. Biol. Cobuci,Jaime Araujo; Euclydes,Ricardo Frederico; Costa,Claudio Napolis; Torres,Robledo de Almeida; Lopes,Paulo Sávio; Pereira,Carmen Silva. A model for analyzing test day records including both fixed and random coefficients was applied to the genetic evaluation of first lactation data for Holstein cows. Data comprising 87045 test-day milk yield records from calving between 1997 and 2001 from Holstein herds in 10 regions of the Brazilian state of Minas Gerais. Six persistency of lactation measures were evaluated using breeding values obtained by random regression analyses. The Wilmink function was used to model the additive genetic and permanent environmental effects. Residual variance was constant throughout lactation. Ranking for animals did not change among criteria for persistency measurements, but ranking changes were observed when the estimated breeding value (EBV) for persistency of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic evaluation; Persistency of lactation; Rank correlation; Random regression models. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300009 Registros recuperados: 2 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco