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Journal of Dairy Science Vol. 74 No. 4 1370-1381
© 1991 by American Dairy Science Association ®
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Slow Release Somatotropin in Dairy Heifers and Cows Fed Two Levels of Energy Concentrate. 1. Performance and Body Condition

B. Remond 1, M. Cisse 1, A. Ollier 1, and Y. Chilliard 1

1 Laboratoire Lactation et Élevage des Ruminants, Institut National de la Recherche Agronomique, 63122 Saint-Genés-Champanelle, France

Fifty-two Holstein dairy cows (27 primiparous) were used in a 2 x 2 factorial design during wk 9 to 39 of lactation to assess the effects of slow release recombinant bST (500 mg injected at 14-d intervals) and the effects of the level of energy concentrate in the diet on dairy performance. After a winter period, cows were turned out to pasture at wk 24 of lactation.

During winter, cows given low concentrate (2.5 vs. 5.4 kg DM/d) ate signicantly more corn silage (13.9 vs. 11.9 kg DM/d), so that treatment had no significant effect an any measured parameter. The milk yield of bST-supplemented cows increased by 2.1 kg/d (11.0%) throughout the total experimental period. The response did not differ according to parity. Milk fat content and SCC were not altered, but milk protein was lower (.8 g/kg) from cows receiving bST during winter, and lactose increased (.5 g/kg). Lactation curyes of bST-supplemented cows showed a cyclic response in milk production. Gross efficiency of milk yield was improved (.18 units) by bST administration without change in diet digestibility. No difference due to bST was found in the health or reproduction of cows.

Live weight change did not differ among the groups. Multiparous cows gained body condition (bST-supplemented animals gained less than controls: .1 vs. .7 point on a five-point scale; NS). Control primiparous cows gained body condition (.1 point) but bST-supplemented cows significantly lost body condition (1.4 point).

Key Words: somatotropin • dairy performance • body condition

Submitted on May 29, 1990
Accepted on November 2, 1990




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Copyright © 1991 by the American Dairy Science Association ®.