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Limiting Amino Acids in an 11% Crude Protein Corn-Soybean Meal Diet for Growing Pigs

University of Illinois^,3,4,, Urbana, 61801

Abstract

Three experiments were conducted to test the hypothesis that methionine, isoleucine, valine or nitrogen either singly or in combination are limiting in an 11% crude protein, lysine-tryptophan-threonine-supplemented, corn-soybean meal diet for growing pigs. A 16% crude protein diet was used as a positive control in each experiment and all amino acid additions were made, at a minimum, to equal requirements. Average initial weights were 21.3 kg, 23.0 kg and 19.1 kg in Exp. 1, 2 and 3, respectively. The experiments averaged 4 wk in duration. In Exp. 1 and 2, neither the addition of glutamic acid as a source of nitrogen, nor methionine to the 11% diet resulted in any improvement (P>.20) in rate or efficiency of growth. Addition of the combination of isoleucine and valine to the 11% diet resulted in an increase (P<.05) in both growth rate and feed efficiency to a level not different (P>.20) from that of the pigs consuming the positive control diet. The addition of valine to the 11% crude protein diet with supplemental lysine, tryptophan and threonine (Exp. 3) caused an improvement in daily gain (P<,05) but not feed efficiency (P>.10). Isoleucine addition tended to reduce pig performance. The results of these experiments suggest that an 11% crude protein, corn-soybean meal diet fortified with lysine, tryptophan and threonine is not limiting in sulfur amino acids or nitrogen. Valine may be the only limiting amino acid.

¹ Current address: Feed Specialties Co., 1877 NE 58th Ave., Des Moines, IA 50313.

² Reprint requests should be addresses to this at 318 Mumford Hall, 1301 W. Gregory Drive, Urbana, IL 61801.

³ Dept. of Anim. Sci.

⁴ The assistance of Scott Williamson, Howard Cook, Dale Alexander, Ron Brewer and Steve Heffernan with diet reparation and animal care and that of Miss Julie Thode with manuscript typing is gratefully acknowledged.

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