STUDY ON THE HERITABILITY OF MILK PRODUCTION IN A LINE OF HOLSTEIN FREISE

Abstract

Livestock genetical structure improvement from one generation to another request, among others, the knowledge of their genetical parameters. The guidance of livestock genetical structure involves the knowledge of the share caused by genetical and environmental factors concerning the variability observed at the livestock level. The knowledge of heritability coefficient values makes easy the livestock genetical improvement, this one indicating the resolution of the traits to be improved. In this respect, there was estimated the milk production heritability, of the protein percent, of the fat percent, in a line of Holstein-Friese, during three generations. The heritability coefficients analysis, estimated by means of the interclass correlation method, for the three traits in the lactations dynamics, emphasized different values from one lactation to another, values justified by different sample genetical structures and respectively the different environmental conditions where these ones evolved. With little exceptions, the heritability coefficients values were comprised between 0.2 and 0.4, values which frame the traits within the group of those intermediary heritable. This genetical determinism of the analysed traits within the line of Holstein-Friese recommends that this one may be relatively easy to improve.

Keywords

• heritability
• milk production
• protein percent
• fat percent
• livestock