1. Modified Contemporary Comparison sire evaluations from first, all, and later lactations;Cassell;J. Dairy Sci.,1983
2. Dickinson, F. N., H. D. Norman, R. L. Powell, L. G. Waite, and B. T. McDaniel. 1976. Procedures used to calculate the USDA-DHIA Modified Contemporary Comparison. Page 18 in USDA Prod. Res. Rep. 165, Washington, DC.
3. Heritability of milk yield and composition at different levels and variability of production;Hill;Anim. Prod.,1983
4. Trends in genetic and phenotypic variances for milk production;Mirande;J. Dairy Sci.,1985
5. Norman, H. D. 1986. Sire evaluation procedures for yield traits. Natl. Coop. Dairy Herd Improvement Progr. Handbook, Fact Sheet H-l, Washington, DC.