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2. Dickinson, F. N., R. L. Powell, and H. D. Norman. 1976. An introduction to the USDA-DHIA modified contemporary comparison. pp. 1-7. Prod. Res. Rep. 165, USDA.
3. Editing of lactation records used in USDA-DHIA genetic evaluations of sires and cows. 1970. ARS 44-222, USDA.
4. Why new sire summaries are needed;McDaniel;J. Dairy Sci.,1974
5. Herdmates versus contemporaries for evaluating progeny tests of dairy bulls;McDaniel;J. Dairy Sci.,1973