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Journal of Dairy Science Vol. 73 No. 3 735-748
© 1990 by American Dairy Science Association ®
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Effects of Dietary Protein Degradability and Casein or Amino Acid Infusions on Production and Plasma Amino Acids in Dairy Cows

William M. Seymour 1, Carl E. Polan 1, and Joseph H. Herbein 1

1 Department of Dairy Science, Virginia Agricultural Experiment Station, College of Agriculture and Life Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061

Responses to daily abomasal infusions of 400 g sodium caseinate, 400 g hydrolyzed casein, or 11.3 g L-methionine plus 30.1 g L-lysine were compared in eight Holstein cows fed diets with estimated ruminal protein degradabilities of 70 and 60.5%. Basal diets contained corn silage and corn with either soybean meal or 66.7:33.3 soybean meal:corn gluten meal added. Infusion with Methionine plus lysine increased milk protein content when cows were fed either diet but increased milk fat content and yield only when the soybean meal diet was fed. Sodium caseinate increased milk and milk protein production and decreased milk fat percentage. Concentration of total essential amino acids, branched chain amino acids, and urea cycle amino acids were increased by the infusion of both casein sources. Methionine-lysine infusion increased plasma lysine and taurine, a metabolite of methionine, suggesting that absorbed methionine was extensively metabolized. Results demonstrate an impact of both ruminal degradability of dietary protein and form of infused protein on amino acid nutrition of lactaring dairy cows.

Key Words: casein • amino acids • abomasal infusion

Submitted on December 7, 1988
Accepted on August 28, 1989




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