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Journal of Dairy Science Vol. 70 No. 11 2355-2365
© 1987 by American Dairy Science Association ®
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Effects of Sixty-Day Milk Yield on Postpartum Breeding Performance in Holstein Cows1

H. Hamudikuwanda2 and H. N. Erb3

Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca, NY 14853

R. D. Smith

Department of Animal Science, New York State College of Agriculture and Life Sciences, Cornell University, Ithaca, NY 14853

3 Reprint requests.

ABSTRACT

The relationship between breeding performance and postpartum milk yield was evaluated using data collected in a prospective field project from 33 New York Holstein herds. Herds selected were enrolled in the New York Dairy Herd Improvement Cooperative program and monthly or biweekly herd health visits from the New York State College of Veterinary Medicine. Factors other than milk yield (e.g., postpartum reproductive disorders, inseminator, housing) that influence breeding performance were controlled in multiple regression analyses. Milk yield had a slight linear antagonistic relationship with conception at first service, services per conception, and days open but not with interval from parturition to first service, interval between first and second services, or interval between second and third services. Services per conception and days open increased by .009 and .6, respectively, for each 100-kg increase in cumulative milk yield during the first 60 d of lactation. Postpartum reproductive disorders, service method (artificial vs. natural), inseminator (farmer vs. technician), and calving interval of the previous lactation had more important relationships than milk yield with measures of breeding performance.

FOOTNOTES

1 Supported in part by USAID, USDA-SEA research grant Number 59-2361-0-2-073-0 and the Cornell University Agricultural Experiment Station.

2 Present address: Henderson Research Station, P. Bag 20041, Mazowe, ZIMBABWE.






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Copyright © 1987 by the American Dairy Science Association ®.