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Two Sources of Genetic Error in Sire Proofs¹

Animal Science and Dairy Science Department, Iowa State University, Ames

ABSTRACT

The purpose of this study was to investigate the importance of genetic improvement and differences among mates as sources of error in sire proofs. The annual genetic improvement in the population expressed as a per cent of the average production was .26% for milk and .24% for milk fat. There were significant differences among sires in the production of their mates when ten mates were considered, but not when 20 or 40 mates were considered. It was concluded that at the present time these two factors are relatively unimportant in the selection of sires but, in certain situations, either factor may cause inaccurate selections.

¹ Journal Paper no. J-5303 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project no. 1053. This research was part of the North Central Regional Project NC-2.

² Present address: Department of Animal Sciences, Washington State University, Pullman, Washington.