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Journal of Dairy Science Vol. 59 No. 11 1985-1988
© 1976 by American Dairy Science Association ®
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Managing Reproduction in Dairy Cattle. II. Response of Cows to Progestogen Treated Herdmates during the Postpartum Period1

J. S. Weston2 and L. C. Ulberg

Department of Animal Science, North Carolina State University, Raleigh 27607

ABSTRACT

Sixty-eight lactating Holstein cows were handled as one unit but were either fed melengestrol acetate for 14 days or were contemporary controls. Cows that calved in a 21-day period were assigned to a treatment group. Those that calved during the subsequent 21 days served as controls and received no treatment. The alternating assignment was continued for 6 mo. Treated cows were between 14 to 35 days postpartum at the beginning of the feeding period. Data from all cows, combined, showed a decrease in days open (120 to 92) and services per conception (2.7 to 1.5) as compared with their previous year's record. The 34 control cows exhibited estrus over a period which coincided with that of 91% of the treated animals, with a slight delay in occurrence of first estrus. The observations suggest that control cows responded in some way to the treated cows in the early stages of the postpartum period.

FOOTNOTES

1 Paper No. 5019 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, is a contribution from the Reproductive Physiology Research Laboratory. Use of tradenames in this publication does not imply endorsement by the North Carolina Agricultural Experiment Station of the products named, nor criticism of similar ones not mentioned.

2 Recipient of funds from the North Carolina Dairy Foundation as a research assistantship.






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Copyright © 1976 by the American Dairy Science Association ®.