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Journal of Dairy Science Vol. 65 No. 8 1578-1587
© 1982 by American Dairy Science Association ®
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Predicition of Modified Contemporary Comparisons from Pedigree Information for Artificial Insemination and Natural Service Bulls1,2,

W. E. Vinson and J. M. White

Virginia Polytechnic Institute and State University, Blacksburg 24061

ABSTRACT

Progeny test evaluations for milk yield by modified contemporary comparison of 12,207 Holstein bulls (sons) were predicted from genetic evaluations of their sires, dams, and maternal grandsires. Evaluations of sires and maternal grand-sires were contemporary comparisons of records of daughters initiated prior to the birth of each son. Evaluations of dams were from first, later, and all available records initiated prior to birth of sons. Sons, sires, and maternal grandsires were classified as in artificial insemination or not.

Intensity of selection by pedigree was higher for sons in artificial insemination. However, regressions of evaluations of sons on those of ancestors generally were less in bulls in artificial insemination than for other bulls. Additionally, intercepts to predict evaluations of sons varied widely across populations of bulls, suggesting improvements are possible in adjustments of evaluations for genetic improvement.

Evaluations of dams by production in first lactations were most useful in predicting evaluations of sons. However, adding evaluations of dams to those for sires and maternal grandsires did not increase accuracy of prediction of bulls in artificial insemination.

FOOTNOTES

1 Published with the approval of the Director of the Agricultural Experimental Station.

2 Partially supported by a grant from the National Association of Animal Breeders.






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Copyright © 1982 by the American Dairy Science Association ®.