Two Sources of Genetic Error in Sire Proofs

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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 10 mates were considered, but not when 20 or 40 mates were considered. At the present time these 2 factors are relatively unimportant in the selection of sires but, in certain situations, either factor may cause inaccurate selections.
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