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Comparison of Procedures Used for Evaluating Sires Used in Artificial Insemination

Department of Animal Husbandry Cornell University, Ithaca, New York

ABSTRACT

The correlations between evaluation procedures, based on deviations from contemporaries of first records and averages of records of daughters and a method currently used at the New York Dairy Records Processing Laboratory, are computed for records of daughters of 198 A.I. Holstein sires. These correlations are successively recalculated for number of daughters per sire greater than 20, 50, and 200. The relationships are relatively low when all sires are included in the analysis. For more than 50 daughters, a few correlations are large enough to warrant consideration of these procedures in sire evaluation when computing facilities are limited.