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Factors That Should Be Considered in a National Sire Summary Model¹

Animal Physiology and Genetics Institute, Animal Improvement Programs Laboratory Beltsville, Maryland 20705

ABSTRACT

Substantial work at Cornell University and USDA in the past few years has been toward changes needed in sire evaluation methods for the United States. Our goal is to get genetic estimates on all bulls and to consider factors that make these estimates as representative as possible of the genetic transmitting ability of sires. To accomplish this goal it seems necessary to include a mechanism for handling environmental correlation.

Additional information is added through multiple records. This is costly gain and should be examined closely to determine the value of this addition.

Pedigree estimates are effective in prediction of performance. Pedigree indexes will be tested as a method of grouping along with other methods to determine what is the most effective means of removing genetic differences.

¹ Paper presented at ADSA meeting, June 25, 1973, Pullman, Washington.