1. Estimates of genetic and environmental variances of first and later lactations at different production levels;Boldman;J. Dairy Sci.,1988
2. Genetic parameters for first lactation milk yields at three levels of herd production;De Veer;J. Dairy Sci.,1987
3. The problem of heterogeneous within herd error variances when identifying elite cows;Everett;J. Dairy Sci.,1982
4. Heritability of milk yield and composition at different levels and variability of production;Hill;Anim. Prod.,1983
5. A simple method for computing the inverse of a numerator relationship matrix used in prediction of breeding values;Henderson;Biometrics,1976