The application of six different models to estimate the genetic parameters, variance components and breeding values for birth weight of Holstein calves

摘要: ABSTRACTThis research was conducted to determine variance component, genetic parameters and breeding values (EBV) for the birth weight (BW) of Holstein calves. In this context, direct (), maternal () permanent environmental effects, which affect BW, were separately assessed. The multi-trait, derivative-free restricted maximum likelihood programme used determining effect by using models that either included or excluded and/or effects. estimation BW calves optimized evaluating six different models. best model chosen according log-likelihood ratio tests. Within context study, a total 4443 investigated between 1987 2006. Among models, 4 selected as model, since it had lowest value ratio. range heritability her...