Animal Science Department


Date of this Version

June 1970


Published in Journal of Dairy Science. Copyright © 1970 American Dairy Science Association. Used by permission.


Biases in evaluation of sires result from misidentified records in the sire group averages used for sire evaluation. The bias increases as the fraction of misidentified cows increases. Use of variance components estimated from misidentified records also contributes to the bias. Estimates of the correlation between estimated and true genetic value, as well as estimates of genetic progress due to selection, are biased when misidentified records are included in sire group averages.