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Journal of Dairy Science Vol. 79 No. 5 800-812
© 1996 by American Dairy Science Association ®
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Responses of Dairy Cows Supplemented with Somatotropin During Weeks 5 Through 43 of Lactation

William Chalupa 1, Bonnie Vecchiarelli 1, David T. Galligan 1, J. D. Ferguson 1, L. S. Baird 2, R. W. Hemken 2, R. J. Harmon 2, C. G. Soderholm 3, D. E. Otterby 3, R. J. Annexstad 3, J. G. Linn 3, W. P. Hansen 3, F. R. Ehle 3, D. L. Palmquist 4, and R. G. Eggert 5

1 Center for Animal Health and Productivity, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348
2 Department of Animal Sciences, University of Kentucky, Lexington 40546
3 Department of Animal Science, University of Minnesota, St Paul 55108
4 Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 4461091
5 American Cyanamid Co., Princeton, NJ 08540

Beginning at wk 5 of lactation, 136 cows (34 per treatment) were supplemented daily for 38 wk with 0, 10.3, 20.6, or 41.2 mg of recombinantly derived bST monomer. Cows were obtained from University of Kentucky, University of Minnesota, University of Pennsylvania, and The Ohio State University. Nine cows (4 at 0 mg/d, 1 at 10.3 mg/d, 1 at 20.6 mg/d, and 3 at 41.2 mg/d) did not complete the experiment because of health problems. Data from these cows were included in the reproduction and health databases but not in the production database. Cows supplemented with bST produced more milk, consumed more feed, had lower rates of BW gain, and had improved efficiencies of milk production (conversion of feed and NEL to milk). Additional increases in productivity were modest at 20.6 and 41.2 mg/d versus productivity at 10.3 mg/d of bST. Concentrations of fat, protein, and TS in milk were unaffected. At 10.3 mg/d, bST did not adversely affect reproduction or health.

Key Words: somatotropin • lactation • health

Submitted on June 6, 1995
Accepted on December 27, 1995




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Copyright © 1996 by the American Dairy Science Association ®.