RESEARCH REGARDING MILK PRODUCTION TRAITS ON A HOLSTEIN-FRIESIAN BREED POPULATION FROM MOLDOVIAN REGION

Nicoleta Roşca (Dulgheru), Şt. Creangă, Mihaela Ivancia, V. Maciuc

Abstract
    The aim of this study was estimation of genetic parameters for five quantitative traits for milk production. In this research were analyzed 191 cows from 24 bulls from Holstein-Friesian breed from a farm in the Moldovian region. The used information in this study were obtained from primary data processing according to the ICAR guidelines. Estimation of genetic parameters was performed through S.A.V.C. software. The estimated heritabilities, after data processing, were 0.27 for the milk yield, 0.31 for fat yield, 0.28 for protein yield, 0.76 for the percentage of fat and 0.65 for the percentage of protein. The repeatability coefficients for the analyzed traits were 0.30 for milk yield, 0.35 for fat yield, 0.31 for protein yield, 0.86 for fat percentage and 0.68 for protein percentage. The correlations between the traits showed that genetic correlation ranged from -0.13 to 0.98, phenotypic correlation ranged from -0.16 to 0.99 and environmental correlation from -0.23 to 0.99. In conclusion, the results were between the values found in the specialty literature.

Key words: genetic parameters, heritability, repeatability, genetic correlations