Multiple trait genetic analysis of growth in the Pirenaica beef cattle breed | Análisis genético multicarácter del crecimiento en vacuno pirenaico
2011
González Rodríguez, A., Universidad de Zaragoza (España). Unidad de Genética Cuantitativa y Mejora Animal | Altarriba, J., Universidad de Zaragoza (España). Unidad de Genética Cuantitativa y Mejora Animal | Moreno, C., Universidad de Zaragoza (España). Unidad de Genética Cuantitativa y Mejora Animal | Varona, L., Universidad de Zaragoza (España). Unidad de Genética Cuantitativa y Mejora Animal
The main objective of selection for beef cattle is weight at slaughter. Live weights throughout growth are currently used as selection criteria under the hypothesis of favorable genetic correlation with slaughter weight. In this study we used data for weight at 120 (P120) and 210 (P210) days and at slaughter (PSAC) to increase our knowledge about the genetic and environmental relationships between different phases of growth. We obtained a high and positive genetic correlation between P120 and P210, but lower between them and PSAC. Moreover, genetic correlations between gain of weight and the previous weight were null. Finally, it is remarkable the presence of negative residual correlations of around -0.30 between P210 and gain of weight from 210 days to slaughter or gains of weight between 120 to 210 days and 210 days to slaughter. The presence of these negative residual correlations suggests the existence of compensatory growth that is not considered in common strategies of genetic evaluation.
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