1. Butcher, K. R. 1973. Estimating son's progeny test for milk yield from information on his sire, dam and maternal grandsire. Ph.D. Thesis, North Carolina State University, Raleigh.
2. Estimating son's progeny test from his pedigree information;Butcher;J. Dairy Sci.,1976
3. Estimates of sire-son relationships for yield traits in the five major dairy breeds;Dickinson;J. Dairy Sci.,1969
4. Dickinson, F. N., R. L. Powell, and H. D. Norman. 1976. An introduction to the USDA-DHIA Modified Contemporary Comparison. USDA Prod. Res. Rep. No. 165, p. 1.
5. 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. USDA Prod. Res. Rep. No. 165, p. 18.