J. Anim Sci.
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J. Anim Sci. 1978. 46:133-142.
© 1978 American Society of Animal Science
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Availability of Tryptophan Lysine and Threonine in Sorghum for Swine1

J. L. Copelin2 ,3,, C. T. Gaskins2 ,4, and L. F. Tribble2

Texas Tech University, Lubbock, 79409

Abstract

Growth assays were conducted using 236 individually-fed cross-bred weanling pigs to study the availability of the amino acids tryptophan, lysine and threonine in the sorghum hybrid, RS-671. For each amino acid studied, five diets were formulated using sorghum and/ or casein at varying levels as the only sources of that particular amino acid. The amino acid was supplied at 70%of the N.R.C. requirement for the 10-kg pig in all diets, with the other essential amino acids supplemented to 110% of N.R.C. Diets were formulated to be isonitrogenous and isocaloric. Two additional diets with lower test amino acid levels were formulated for the lysine and threonine studies to more accurately define the standard growth curve. Pig gains and amino acid intake were measured for all diets and regression analyses were used to predict pig gain per gram of amino acid consumed. Pig gains were reduced and feed/gain ratios were increased as the amino acid from sorghum was increased in the diets. Availability estimates were: tryptophan, 92.56 ± .43%; lysine, 62.66 ± 58% and threonine, 88.90 ± .14%.

Footnotes

1 Approved by the Dean as College of Agricultural Sciences Publication No. T-5-119.

2 Department of Animal Science.

3 Present address: Animal Science Department, University of Florida Gainesville.

4 Present address: Department of Animal Sciences, Washington State University, Pullman.






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Copyright © 1978 by the American Society of Animal Science.