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	Provedor de dados Arq. Bras. Med. Vet. Zootec. (2) Autor Espinoza-Villavicencio,J.L. (2) Avila,N.Y. (1) González-Peña,D. (1) Guerra,D. (1) Guillén,A. (1) Palacios,A. (1) Palacios-Espinosa,A. (1) Portales,A. (1) de Luna,R. (1) Évora,J.C. (1) Mais... Palavra-chave BST-r (1) Dairy cattle (1) Dairy cow (1) Days open (1) Genetic correlations (1) Heritability (1) Mathematical model (1) Postpartum interval (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2010 (2) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última 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 Extension model of lactation curves to evaluate the effect of the recombinant bovine somatotropin on milk yield in Holstein cows Arq. Bras. Med. Vet. Zootec. Palacios-Espinosa,A.; Espinoza-Villavicencio,J.L.; de Luna,R.; Guillén,A.; Avila,N.Y.. An extension model of lactation curves was used to determine the effect of recombinant bovine somatotropin (bST-r) on milk yield in Holstein dairy cattle. This model use the fitted values obtained by the Wood model, and was tested on the records of 66 cows. The milk yield predicted with the extension model and the observed yield were compared and no significant differences were observed (P>0.05). Once the extension model was validated, the milk yield tests of 199 cows were used. The cows received bST-r 500mg by subcutaneous injections. The injections were applied after 100 days in milk at 14-day intervals (seven injections). The observed milk yield was compared with the yield expected by the extension model. An increase of 5.3% was observed in milk... Tipo: Info:eu-repo/semantics/article Palavras-chave: Dairy cattle; BST-r; Mathematical model. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000100017 Registros recuperados: 2 Primeira ... 1 ... Última

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