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Journal of Dairy Science Vol. 51 No. 2 306-311
© 1968 by American Dairy Science Association ®
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Dairy Cattle Breeding

Changes in USDA Sire Summary Procedures

R. D. Plowman and B. T. McDaniel

Animal Husbandry Research Division, USDA, Beltsville, Maryland

ABSTRACT

The primary changes in USDA procedures for proving bulls are concerned with properly accounting for the number of herds, distribution of daughters across herds, and the number of records per daughter. These procedures will utilize all available information and give it proper weight in arriving at estimates of breeding value for individual bulls. The other information presented, such as the repeatability of sire summary, per cent of incomplete first records, number of herds represented, etc., will serve as additional guidelines to be used in interpreting the estimates of breeding value.






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Copyright © 1968 by the American Dairy Science Association ®.