Author
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WU, Z - UNIV OF WISCONSIN MADISON |
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LE GUILLOUX, CHRISTOPHE - STUDENT INTERN FRANCE |
|
Satter, Larry |
|
Submitted to: Journal Dairy Science Supplement
Publication Type: Abstract Only Publication Acceptance Date: 6/23/1999 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Lactation response to supplementation of Met was determined in two trials. In trial 1, dietary protein at 16.3, 17.9, or 19.8% with or without 12 g/d of rumen protected Met was used in a factorial arrangement of treatments with 4 replicated 6 x 6 Latin squares. Alfalfa silage and corn silage (3 : 2) were the forages, and roasted soybeans and expeller processed soybean meal were the protein supplements. The NEL of the diets was 1.63 Mcal/kg. Trial 2 used the same protocol except that 15.3 or 17.0% dietary CP was used in 6 replicated 4 x 4 Latin squares. The NEL of the diets was increased to 1.72 Mcal/kg. Milk yield, measured in the last wk of each 3-wk experimental period, was not affected by supplementation of Met in either trial. Supplementation of Met appeared to enhance milk protein production (Supported in part by the Wisconsin Soybean Marketing Board, Madison, WI. and Degussa Corporation, Ridgefield Park, NJ). Dietary CP% without (-) or with (+) Met Trial 1 16.3- 16.3+ 17.9- 17.9+ 19.8- 19.8+ SEM DMI, kg/d 23.9 23.7 24.2 24.1 23.7 23.9 .5 Milk, kg/d 37.6 37.9 36.5 37.2 38.5 37.4 1.4 Milk Protein, % 2.92 2.94 2.95 2.96 2.89 2.96 .04 Milk Protein, kg/d 1.09 1.11 1.07 1.10 1.11 1.10 .04 Trial 2 15.3- 15.3+ 17.0- 17.0+ SEM DMI, kg/d 22.3 21.8 23.3 23.6 .8**a Milk, kg/d 34.8 34.6 36.7 37.0 1.1**a Milk Protein, % 2.96 3.06 2.99 3.03 .05**b Milk Protein, kg/d 1.01 1.05 1.08 1.11 .05**a **aDietary protein effect (P <. 1 0); **bMethionine effect (P = .15) |
