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Responses of Dairy Cows in Early Lactation to Bovine Somatotropin and Ruminally Inert Fat

Real Veal, Inc., Ixonia, WI 53036
Faculty of Agriculture, Hebrew University, POB 12 Rehovot 76-100, Israel
Virginia Tech, Blacksburg 24061
School of Veterinary Medicine, University of Pennsylvania, New Bolton Center, Kennett Square 19348

Bovine somatotropin (0 or 41.2 mg/d bST) and calcium salts of long-chain fatty acids (0 or .77 kg/d Ca-LCFA) were administered to 16 Holstein cows in early lactation. Cows remained on 0 or 41.2 mg/d bST for the entire 10 wk and received 0 or .77 kg/d Ca-LCFA in one of two 5-wk periods. Production data were recorded daily, milk fatty acids, and blood metabolites were determined once each period. Treatments did not affect feed intake. Fat-corrected milk (kg/d) and percentage of milk fat for cows receiving no supplementation, fatty acids alone, bST alone, and fatty acids and bST together were 33.8, 3.2; 33.5, 3.1; 37.4, 3.4; and 40.8, 3.5. Milk fatty acids below C₁₆ were reduced with either bST or dietary fatty acids; C₁₆ fatty acids were lower with bST but higher with dietary fatty acids; C_18:0 fatty acids were reduced with dietary fatty acids; and C_18:1 fatty acids were higher with either bST or dietary fatty acids. Blood acetoacetate concentrations were higher with both bST and dietary fatty acids, -hydroxybutyrate was not different, and FFA and insulin concentrations increased with bST. In this experiment, the energy supplied by Ca-LCFA acids enhanced the lactogenic effect of bST.

This article has been cited by other articles:

				M. Carriquiry, W. J. Weber, and B. A. Crooker Administration of Bovine Somatotropin in Early Lactation: A Meta-Analysis of Production Responses by Multiparous Holstein Cows J Dairy Sci, July 1, 2008; 91(7): 2641 - 2652. [Abstract] [Full Text] [PDF]