Data/hora: 04/06/2024 06:30:50

Provedor de dados: | 45
País: | Brazil
Título: | Components of (co)variance of the days open in Siboney dairy cows
Autores: | González-Peña,D.; Espinoza-Villavicencio,J.L.; Guerra,D.; Palacios,A.; Évora,J.C.; Portales,A.
Data: | 2010-02-01
Ano: | 2010
Palavras-chave: | Dairy cow; Genetic correlations; Heritability; Postpartum interval; Days open.
Resumo: | The records of 63,406 calvings of Siboney dairy cows (5/8 Holstein 3/8 Cuban Zebu) were used to estimate the components of covariance of the days open (DO). Five models were used: of repeatability; univariate; bivariate; of random regression with Legendre polynomials and the parity number as predicting variable; and a model of random regression with Legendre polynomials and heterogeneity of the residual variance. The heritability obtained with the univariate model was 0.09 in the first calving and decreased to 0.05 in the fifth. A higher estimate of heritability (0.12) was obtained with the repeatability model. When the model of random regression with heterogeneity of the residual variance was used, the heritability was higher than the values estimated with the previous models. The genetic correlations among the DO in different calvings, estimated with the models of random regression with and without heterogeneity of the residual variance, were close to 1.0. It is concluded that the estimates of heritability increased with the use of the random regression models. The genetic correlations among the DO of different calvings indicated that in the first three, the DO are regulated for the most part by the same genes.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000100019
Editor: | Universidade Federal de Minas Gerais, Escola de Veterinária
Relação: | 10.1590/S0102-09352010000100019
Formato: | text/html
Fonte: | Arquivo Brasileiro de Medicina Veterinária e Zootecnia  v.62 n.1 2010
Fonte: | info:eu-repo/semantics/openAccess