Department of Animal Science


Date of this Version

January 1983


Published in J Dairy Sci 1983, 66:1370-1376. Copyright © 1983 The American Dairy Science Association. Used by permission.


A modification of the evaluation method for cows in the northeast United States allowed simultaneous evaluation of cows in pairs of herds and computation of variances of prediction errors of differences of genetic potential between pairs of cows within and across herds. These variances were examined for 20 pairs of herds in Holstein, Jersey, and Brown Swiss breeds. Current evaluations of cows are nearly as accurate for comparing cows from different herds as they are for comparing cows from the same herd.