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Journal of Dairy Science Vol. 62 No. 7 1140-1144
© 1979 by American Dairy Science Association ®
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Relationship between Milk Yield and Fertility in Dairy Cattle1

D. Olds, T. Cooper2 and F. A. Thrift

Department of Animal Sciences, University of Kentucky, Lexington 40506

ABSTRACT

In three studies of 51,618 Holstein, 6,630 Jersey, and 1,524 Guernsey records, correlation was .07 between 120-day milk yield and number of services required for probable conception, independent of days postpartum. The partial regression coefficient for Holsteins was .014 ± .001 more services for each additional 100 kg of 120-day milk. For Jerseys and Guernseys, .028 ± .008 more services were required for each additional 100 kg of 120-day milk.

FOOTNOTES

1 Published with approval of the Director of the Kentucky Agricultural Experiment Station as Journal Article 78-5-96.

2 Director of the USDA Fort Collins Computer Center, 3825 E. Mulberry Street, Fort Collins, CO 80521.






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Copyright © 1979 by the American Dairy Science Association ®.