Estimation of genetic parameters for milk traits in Romanian local sheep breed/Estimacion de parametros geneticos para caracteristicas de la leche en la raza ovina local Rumano
Objective. Estimate the genetic parameters for milk traits in a Romanian local sheep population Teleorman Black Head. Material and methods. Records of 262 sheep belonging to 17 rams and 139 ewes were used in the study. The following traits were investigated: milk yield, fat yield, protein yield, fat...
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Published in | Revista MVZ (Medicina Veterinaria y Zootecnia) Vol. 19; no. 1; p. 4033 |
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Main Authors | , , , , |
Format | Journal Article |
Language | Spanish |
Published |
Universidad de Cordoba
01.01.2014
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Online Access | Get full text |
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Summary: | Objective. Estimate the genetic parameters for milk traits in a Romanian local sheep population Teleorman Black Head. Material and methods. Records of 262 sheep belonging to 17 rams and 139 ewes were used in the study. The following traits were investigated: milk yield, fat yield, protein yield, fat percentage and protein percentage. The genetic parameters were estimated using the Restricted Maximum Likelihood method, with a model including maternal effects. Results. The results from our study revealed that direct heritability estimates were moderate for milk yield (0.449), fat yield (0.442), protein yield (0.386) while for protein percentage (0.708) and fat percentage (0.924) were high. The high direct and maternal genetic correlation was between milk yield and protein yield (0.979, 0.973) and between protein yield and fat yield (0.952, 0.913) while the phenotypic correlation between the milk yield and fat yield (0.968), the milk yield and protein yield (0.967), fat yield and protein yield (0.936) was high and positive. Conclusions. The genetic parameters are important in selection program on this breed for genetic improvement. Key Words: Genetic improvement, milk production characteristics, ovinos (Source: CAB). Objetivo. Estimar los parametros geneticos para caracteristicas de la leche en una poblacion de ovinos locales Rumanos Teleorman cabeza negra. Materiales y metodos. En el estudio se utilizaron registros de 262 animales pertenecientes a 17 carneros y 139 ovejas. Se investigaron los siguientes rasgos: produccion de leche, produccion de grasa, produccion de proteina, porcentaje de grasa y porcentaje de proteina de la leche. Los parametros geneticos fueron estimados mediante el metodo de Maxima Verosimilitud Restringida, con un modelo que incluye efectos maternos. Resultados. Los resultados de este estudio revelaron que la heredabilidad directa fue moderada para la produccion de leche (0.449), produccion de grasa (0.442) y produccion de proteina (0.386) mientras que para el porcentaje de proteina (0.708) y el porcentaje de grasa (0.924) fueron altos. La alta correlacion genetica directa y materna se produjo entre la produccion de leche y la produccion de proteina (0.979, 0.973) y entre la produccion de proteina y de grasa (0.952, 0.913) mientras que la correlacion fenotipica entre la produccion de leche y de grasa (0.968), la produccion de leche y proteina (0.967), la produccion de proteina y de grasa (0.936) fue alta y positiva. Conclusiones. Los parametros geneticos son importantes en el programa de seleccion de esta raza para el mejoramiento genetico. Palabras clave: Caracteristicas de la produccion de leche, mejoramiento genetico, sheep (Fuente: CAB). |
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ISSN: | 0122-0268 |