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The objective of this study was to estimate genetic parameters for the body weights of Turkish Holstein bulls using  the random regression model. The data set consists of 1475 body weight records from 395 Holstein bulls raised in the  same herd. Body weight records of bulls aged between 32 and 725 days old were collected at approximately two-month  intervals from December 2013 to October 2014. In the study body weight measurements made on the same day were  accepted as a group and the bulls were grouped into 10 different groups according to their age. The additive genetic and  permanent environmental effects were estimated using DFREML algorithm by third order Legendre polynomials. The  additive genetic variance estimates ranged from 10.73 to 4867.07, the phenotypic variance estimates ranged from 382.84  to 5514.86 and permanent environmental variance estimates ranged from 0.33 to 63.27. The heritability values were  estimated between 0.03 to 0.90. The phenotypic and additive genetic correlations between body weights were positively  estimated between 0.085 to 0.89 and 0.53 to 0.94, respectively. It was concluded that use of body weight at an earlier age  will give advantage in breeding studies for body weight at slaughter.

Estimates of Genetic Parameters for Body Weight in Turkish Holstein Bulls using Random Regression Model