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A Standard for Evaluation of Dairy Sires Proved in Dairy Herd Improvement Associations^*

Division of Dairy Husbandry, Univeristy of Minnesota

ABSTRACT

1. From the lists of sires proved in dairy herd improvement associations, compiled by the Bureau of Dairy Industry, formulas have been derived for estimating the average expected production of daughters according to the productive level of the dams.
   
2. This average expected production of milk, of fat, and for fat percentage is presented in graphical form, to be used as a guide in evaluating progeny tested bulls and in predicting probable production of future daughters.
   
3. A modification of Norton's sire index is suggested for comparative rating of sires. Twice the deviation of the sire's daughters' production from the expected is added (negative deviations carrying a minus sign) to the breed average for potential performance of sire to give an estimate of the sire's hypothetical productive ability under average environment for the population.
   
4. To estimate probable production of future daughters, the deviation of his daughters' production from expected is added (deviations below expected being treated as negative values) to the expected production estimated for daughters of the cows to which he is to be mated.
   
5. This method applies the equal parent principle with a simple and workable allowance for regression and general differences of environment.
   

^* Assistance in this research was furnished by personnel of Work Projects Administration, Official Project No. 165-1-71-124, Sub-project No. 448. Miscellaneous Journal Series Paper No. 499, Minnesota Agricultural Experiment Station.

¹ Most of the work on this study was done while the author was a staff member of the Dairy Division of the University of Minnesota. Dr. Allen resigned from the University of Minnesota in August, 1942, to become Associate Professor of Dairy Production at the University of Vermont.