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

Abstract

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.

Use of Mars Data Mining Algorithm Based on Training and Test Sets in Determining Carcass Weight of Cattle in Different Breeds

“…In the study conducted to determine the fattening performance and carcass characteristics of Simental, Aberdeen-Angus, Hereford, Limousine and Charolais breeds, it was reported that while Charolais performed better than others for carcass weight, the Simental breed was higher for daily weight gain (Sak & Duru 2017). Galiç & Takma (2019) have conducted on the determination of live weight and the genetics factors affecting this situation. In addition, it was stated in the studies that subjective and objective methods can be used in estimating the carcass composition in live animals.…”