Two approaches to account for genotype-by-environment interactions for production traits and age at first calving in South African Holstein cattle

Table 7 Goodness-of-fit of analyses based on different models for milk production

Model	BIC−BICmin
U1: Univariate	11,190
U4: Univariate + specific residual variances by region	2016
MTR4: Multivariate by region, rank 4	773
MTR1: Multivariate by region, rank 1	967
C1: Reaction norm on average rainfall	745
C2V: Reaction norm on average rainfall and maximum temperature with genetic correlation = 0 and reduced rank	956
C5V: Reaction norm on 5 variables with genetic correlation between “average production” and a linear regression term on climatic variables	967
RF4: Multivariate, grouping herds according to level of rainfall	0^a

ISSN: 1297-9686