Research Regarding Heritability and Repeatability Coefficients of some Milk Production Traits from Farms in Moldavian Region
Keywords:
heritability, repeatability, yield traits, genetic parameters, Holstein cowAbstract
Aim of this study was estimation of two genetic parameters: heritability and repeatability, for five milk production traits. Data used in current paper consisted from phenotypic information from 998 cows with 1897 yield records. The traits which were considered for 305 days of lactation included milk, fat ant protein yields and percentages of milk fat and protein. Data were statistically analyzed through the S.A.V.C. (Statistical Analyze of Variance and Covariance) software. The estimated heritabilities for studied traits were 0.24 to 0.38 for milk yield (MY), 0.27 to 0.41 for fat yield (FY), 0.61 to 0.87 for percentage of fat (F%), 0.25 to 0.39 for protein yield (PY) and 0.59 to 0.78 for percentage of protein (P%). Repeatability estimates for studied traits ranged from 0.27 to 0.34 for MY, from 0.30 to 0.41 for FY, from 0.67 to 0.86 for F%, from 0.28 to 0.39 for PY and from 0.62 to 0.77 for P%. Results from this paper are in line with values reported from other authors. Also, Fisher results indicate significant differences between studied farms.
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