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Amino Acids in Plasma and Duodenal Digesta and Plasma Growth Hormone in Cows Fed Varying Amounts of Protein of Differing Degradability¹

Department of Animal Science, Michigan State University, East Lansing 48824

ABSTRACT

Eighty-four Holstein cows in early lactation fed diets varying in protein percent (11, 14, and 17% crude protein) and degradability in the rumen (normal and heated soybean meal) were sampled for effects on amino acids and growth hormone in blood plasma, and amino acid profiles in the duodenal digesta. Essential and branched chain amino acids in plasma increased as protein and amount of protected protein in the diet increased. These changes were accompanied by decreased concentrations of nonessential amino acids. Plasma growth hormone was highest at low protein (11.3%) probably because of decreased intakes on this diet. Molar percentages of amino acids in duodenal contents were not affected by diet suggesting that our heat-treated soybean meal influenced quantity more than quality of amino acids available for absorption in the small intestines.

¹ Published with approval of Director of the Agricultural Experiment Station as Journal Article No. 11143.

² Nutrition Chemicals Division, Monsanto Co., T3D, 800 N. Lindbergh Avenue, St. Louis, MO 63167.

³ Department of Animal Sciences, University of Arizona, Tucson 85721.

⁴ Agricultural Canada, Lennoxville Station, Lennoxville, Quebec, Canada J1M 1Z3.