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Journal of Dairy Science Vol. 77 No. 9 2549-2561
© 1994 by American Dairy Science Association ®
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Interval from Calving to Conception in High Producing Dairy Cows Treated with Recombinant Bovine Somatotropin

Emilio Esteban 1, Philip H. Kass 1, Leon D. Weaver 1, Joan D. Rowe 1, Charles A. Holmberg 1, Charles E. Franti 1, and H. Fred Troutt 1

1 School of Veterinary Medicine, University of California, Davis, Davis, 95616

Intervals from calving to conception in cows treated for two lactations with recombinant bST were ascertained using survival analysis methods. Daily intramuscular administration of placebo, 17.2, 51.6, or 86 mg of bST per cow started at d 70 postpartum and ended at culling or drying off. Breeding began at d 70 postpartum. Multiparous cows treated during the first lactation had significantly longer intervals from calving to conception. Cows treated during the previous lactation, but not during the second lactation, had significantly shorter intervals from calving to conception. Cox proportional hazards regression analysis was used with adjustment for the confounding effect of serum metabolites, milk production, energy balance, and body condition.

Key Words: days open • somatotropin • dairy • survival analysis

Submitted on January 18, 1994
Accepted on April 11, 1994






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Copyright © 1994 by the American Dairy Science Association ®.