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Meat and Bone Meals as Sources of Amino Acids for Growing Swine: Use of a Reference Diet to Predict Amino Acid Adequacy by Plasma Levels^{1, 2, 3,}

University of Minnesota, St. Paul

Abstract

MEASUREMENT of concentrations of free amino acids in the plasma appears to offer a useful means of predicting limiting amino acids and availability of amino acids from intact proteins for young swine. It appears to be essential to use a reference diet that contains all essential amino acids at the requirement levels and not providing excesses of individual amino acids. Such a reference diet should support maximal performance of the test animal to facilitate establishment of baseline or reference levels for the various amino acids in the plasma.

Two experiments were conducted to determine the amino acids that appear to be limiting in different sources of meat and bone meal for growth and protein synthesis in growing swine. Concentrations of free amino acids in the plasma of pigs fed diets based on each of six sources of meat and bone meal were compared with those of pigs fed a corn-soybean meal diet, cornstarch-soybean meal diet or a reference diet formulated to meet the amino acid needs of the growing pig.

¹ Paper 7200, Scientific Journal Series of the Minnesota Agricultural Experiment Station.

² Data from a thesis submitted by the senior author to the Graduate School of the University of Minnesota in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

³ Supported in part by a grant-in-aid from the Fats and Proteins Research Foundation, Des Plaines, Illinois.

⁴ NIH Trainee in Nutrition; supported by NIH Training Grant GMO 1041 from the National Institute of General Medical Sciences.