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Journal of Dairy Science Vol. 73 No. 10 2896-2906
© 1990 by American Dairy Science Association ®
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Effects of Bovine Somatotropin on Dry Matter Intake, Milk Yield, and Body Temperature in Holstein and Jersey Cows During Heat Stress

J. W. West 1, B. G. Mullinix 1, J. C. Johnson Jr. 1, K. A. Ash 2, and V. N. Taylor 2

1 University of Georgia, Coastal Plain Station, Tifton 31793
2 The Upjohn Company, Kalamaroo, MI 49001

Thirty-one lactating Holstein and Jersey cows were used to determine the effect of daily injections of 0 or 20 mg of recombinant bST in hot, humid weather. The comparison period lasted 80 d, from mid-June through August. The maximum and minimum ambient temperature and relative humidity averaged 34.6 and 22.2°C and 100 and 59.8%, respectively. Body temperatures of somatotropin-treated Holsteins were elevated over controls by .2 and .3°C at the a.m. and p.m. milkings, respectively, whereas corresponding treatment effects for Jerseys were .5 and .6°C, thus demonstrating a breed by treatment interaction. The response of milk and FCM yields and apparent efficiency of production to somatotropin administration depended on the level of production prior to treatment. Cows at low pretreatment production increased milk and FCM yields to a greater degree than did cows at higher production. A breed by treatment interaction showed that Holsteins increased milk and FCM yields more than Jerseys upon administration of somatotropin. Intake of DM was not affected by treatment. Cows administered bST lost BW and condition score. Greater heat stress was associated with the higher milk production of cows administered bST.

Key Words: bovine somatotropin • heat stress • lactation

Submitted on January 16, 1990
Accepted on May 9, 1990




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