Estimation of genetic parameters and phenotypic and genetic trends of the calving interval in the Mambi de Cuba cattle and its relation with the milk yield
Barra lateral del artículo
Publicado:
mar. 1, 2011
Contenido principal del artículo
Resumen
In order to estimate the genetic parameters and the phenotypic and genetic trends of the CI and its relationship with the MY305,
16 526 records of the calving interval (CI) and the milk yield accumulated up to 305 d (MY305) of 5 881 Mamb? de Cuba cows (? Holstein ? Zebu), were used. The records were from four cattle units and 171 herds. The records corresponded to the period of 1981- 2006.
An univariate animal model was used, including as fixed effects the combination herd-year-calving period of four months; calving age, as
linear and quadratic covariable, and as random effects the animal, the permanent environment and the residuals, to estimate the heritability
and the repeatability of the CI. A bivariate animal model was applied to estimate the genetic and environmental correlation between the CI
and the MY305. The estimates of heritability and repeatability for the CI were of 0.06 ? 0.01 and 0.20 ? 0.01, respectively. The phenotypic
trend for the CI was of 3.13 ? 1.12 days.year-1 and the genetic trend of -1.53 ? 0.16 days.year-1. The genetic and environmental correlations between the CI and the MY305 were of 0.72 ? 0.06 and 0.01 ? 0.01, respectively. It was concluded that the increase in the phenotypic trend for the CI in the Mambi de Cuba cattle was explained by environmental causes and not by the deterioration in the genetic merit. The correlation between the CI and the MY305 was opposite, thus, the increment in the capacity of milk yield of the cows will reduce the reproductive efficiency of the herd.
Key words: Mambi de Cuba cattle, calving interval, genetic parameters, genetic trends, correlation with the milk yield.
16 526 records of the calving interval (CI) and the milk yield accumulated up to 305 d (MY305) of 5 881 Mamb? de Cuba cows (? Holstein ? Zebu), were used. The records were from four cattle units and 171 herds. The records corresponded to the period of 1981- 2006.
An univariate animal model was used, including as fixed effects the combination herd-year-calving period of four months; calving age, as
linear and quadratic covariable, and as random effects the animal, the permanent environment and the residuals, to estimate the heritability
and the repeatability of the CI. A bivariate animal model was applied to estimate the genetic and environmental correlation between the CI
and the MY305. The estimates of heritability and repeatability for the CI were of 0.06 ? 0.01 and 0.20 ? 0.01, respectively. The phenotypic
trend for the CI was of 3.13 ? 1.12 days.year-1 and the genetic trend of -1.53 ? 0.16 days.year-1. The genetic and environmental correlations between the CI and the MY305 were of 0.72 ? 0.06 and 0.01 ? 0.01, respectively. It was concluded that the increase in the phenotypic trend for the CI in the Mambi de Cuba cattle was explained by environmental causes and not by the deterioration in the genetic merit. The correlation between the CI and the MY305 was opposite, thus, the increment in the capacity of milk yield of the cows will reduce the reproductive efficiency of the herd.
Key words: Mambi de Cuba cattle, calving interval, genetic parameters, genetic trends, correlation with the milk yield.
Detalles del artículo
Cómo citar
Hern?ndez, A., Ponce de Le?n, R., Garc?a, S. M., Guzm?n, G., & Mora, M. (2011). Estimation of genetic parameters and phenotypic and genetic trends of the calving interval in the Mambi de Cuba cattle and its relation with the milk yield. Cuban Journal of Agricultural Science, 45(1). Recuperado a partir de https://cjascience.com/index.php/CJAS/article/view/180
Sección
Ciencia Animal
Aquellos autores/as que tengan publicaciones con esta revista, aceptan los términos siguientes:
- Los autores/as conservarán sus derechos de autor y garantizarán a la revista el derecho de primera publicación de su obra, el cuál estará simultáneamente sujeto a la Licencia Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) que permite a terceros compartir la obra siempre que se indique su autor y su primera publicación esta revista. Bajo esta licencia el autor será libre de:
- Compartir — copiar y redistribuir el material en cualquier medio o formato
- Adaptar — remezclar, transformar y crear a partir del material
- El licenciador no puede revocar estas libertades mientras cumpla con los términos de la licencia
Bajo las siguientes condiciones:
- Reconocimiento — Debe reconocer adecuadamente la autoría, proporcionar un enlace a la licencia e indicar si se han realizado cambios. Puede hacerlo de cualquier manera razonable, pero no de una manera que sugiera que tiene el apoyo del licenciador o lo recibe por el uso que hace.
- NoComercial — No puede utilizar el material para una finalidad comercial.
- No hay restricciones adicionales — No puede aplicar términos legales o medidas tecnológicas que legalmente restrinjan realizar aquello que la licencia permite.
- Los autores/as podrán adoptar otros acuerdos de licencia no exclusiva de distribución de la versión de la obra publicada (p. ej.: depositarla en un archivo telemático institucional o publicarla en un volumen monográfico) siempre que se indique la publicación inicial en esta revista.
- Se permite y recomienda a los autores/as difundir su obra a través de Internet (p. ej.: en archivos telemáticos institucionales o en su página web) antes y durante el proceso de envío, lo cual puede producir intercambios interesantes y aumentar las citas de la obra publicada. (Véase El efecto del acceso abierto).