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Journal of Dairy Science Vol. 48 No. 10 1376-1377
© 1965 by American Dairy Science Association ®
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Linearity of Heritability of Holstein First-Lactation Milk Production

L. D. Van Vleck and C. L. Hart

Department of Animal Husbandry, Cornell University, Ithaca, New York

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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Copyright © 1965 by the American Dairy Science Association ®.