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Journal of Dairy Science Vol. 77 No. 11 3371-3381
© 1994 by American Dairy Science Association ®
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Reproductive Performance 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

The reproductive performance of 156 cows treated with recombinant bST for two consecutive lactations was assessed as part of a target animal safety study conducted in the San Joaquín Valley of central California. Daily intramuscular administration of 17.2, 51.6, and 86 mg of bST per cow started at d 70 postpartum and ended at dry-off or 305 d postpartum. The AI did not begin until d 70 postpartum. During the first lactation study, multiparous cows treated with bST had significantly decreased pregnancy rates, increased behavioral anestrus, and increased anestrus confirmed by palpation. Treated primiparous cows in first lactation had shorter mean days to first standing estrus. In the second lactation study, cows treated with bST had an increased rate of delayed uterine involution, cystic ovarian condition, behavioral anestrus, and anestrus confirmed by palpation. Progeny from the first lactation cows were evaluated for rates of growth, morbidity, mortality, and for reproductive performance; no difference was detected between the progeny from different groups.

Key Words: reproduction • somatotropin • dairy • bovine

Submitted on January 18, 1994
Accepted on May 9, 1994




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R. Flores, M. L. Looper, R. W. Rorie, M. A. Lamb, S. T. Reiter, D. M. Hallford, D. L. Kreider, and C. F. Rosenkrans Jr.
Influence of body condition and bovine somatotropin on estrous behavior, reproductive performance, and concentrations of serum somatotropin and plasma fatty acids in postpartum Brahman-influenced cows
J Anim Sci, May 1, 2007; 85(5): 1318 - 1329.
[Abstract] [Full Text] [PDF]


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Copyright © 1994 by the American Dairy Science Association ®.