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	Provedor de dados Arq. Bras. Med. Vet. Zootec. (2) Autor Barahona-Rosales,R. (1) Espinoza-Villavicencio,J.L. (1) González-Peña,D. (1) Guerra,D. (1) Palacios,A. (1) Portales,A. (1) Ruiz-Cortés,Z.T. (1) Sierra-Montoya,E. (1) Évora,J.C. (1) Mais... Palavra-chave Days open (2) Dairy cow (1) Energy balance (1) Genetic correlations (1) Heritability (1) Intake (1) Leucaena (1) Nutritional management (1) Postpartum interval (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2017 (1) 2010 (1) 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 Reproductive behavior of crossbred dairy cows grazing an intensive silvopastoral system under tropical dry forest conditions Arq. Bras. Med. Vet. Zootec. Sierra-Montoya,E.; Barahona-Rosales,R.; Ruiz-Cortés,Z.T.. ABSTRACT It is widely accepted that selection for high milk yield in dairy cows has negatively affected their reproductive performance. After calving, dairy cows experience a nutritional imbalance due to an asynchrony in the occurrence of the lactation and dry matter intake peaks. In the tropics, this situation is exacerbated due to poor quality and/ or availability of the diet. A study was carried out to describe the nutritional and reproductive behavior of two-to-four parturition crossbred cows (Gyr (Bos indicus) x Holstein (Bos taurus)) divided in two groups according to their calving to first service interval (CFSI): Group 1: ≤50 days CFSI, n=7; Group 2: ≥50 days CFSI, n=8. Animals were grazing in an intensive silvopastoral system (ISS) based on... Tipo: Info:eu-repo/semantics/article Palavras-chave: Days open; Energy balance; Intake; Leucaena; Nutritional management. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000100001 Registros recuperados: 2 Primeira ... 1 ... Última

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