Abstract
The regression of daughter on dam first-lactation milk deviations from herd-mate averages was found to be linear from an analysis of 47,400 Holstein pairs. The linear equation was y=−25.6+.210 (x −27.6) and the quadratic equation was y=−25.6+.208 (x −27.6) + .0000222 (x2−44131.4) with correlation coefficients, .18258 and .18268, respectively. These results suggest that selection response can be predicted adequately even with very large selection differentials.
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