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Components of (co)variance of the days open in Siboney dairy cows Arq. Bras. Med. Vet. Zootec.
González-Peña,D.; Espinoza-Villavicencio,J.L.; Guerra,D.; Palacios,A.; Évora,J.C.; Portales,A..
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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dairy cow; Genetic correlations; Heritability; Postpartum interval; Days open.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000100019
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