Estimation of Genetic Parameters of Body Weights in Hanwoo Steers (Korean Cattle), Bos Taurus Coreanae Using Random Regression Model

摘要

The current genetic evaluation of beef cattle for growth utilized muti trait animal model methodology wherein animals are evaluated for weights at certain ages(BIF; 2002). However, actual weighing dates are noted and recorded at certain ages thereby pre-adjusting weights to fixed ages. All records that are outside of the specific age range interval are not used which lowers the accuracy of evaluation. Furthermore Nobre et al. (2003a) reported pre-adjustments of weights to fixed ages are for the meanonly but not the variances.