J. Anim Sci.
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J. Anim Sci. 1977. 45:1079-1083.
© 1977 American Society of Animal Science
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Threonine Requirement of Growing and Finishing Swine Fed Sorghum-Soybean Meal Diets1

R. S. Cohen and T. D. Tanksley, Jr.2

Texas Agricultural Experiment Station, College Station 77843

Abstract

Two experiments (one with growing pigs, 17.7 kg initial weight and one with finishing pigs, 58.9 kg initial weight) were conducted to determine the threonine requirement in sorghum-soybean meal diets. Four barrows and four gilts were individually fed one of six isonitrogenous sorghum-soybean meal diets formulated with a stepwise addition (.06%) of L-threonine. Soybean meal was restricted to ensure that threonine was deficient in the basal diets (.39 and .29% in the growing and finishing diets, respectively). All other essential amino acids were present to provide 110% or more of the requirement based on the 1973 National Research Council estimates of minimum requirements for 16% protein grower and 14% finisher diets. An equimolar glycine-L-glutamic acid mixture was added to obtain the 16% grower and 14% finisher diets.

In the growing experiment, average daily gain (g) and gain/feed (g/kg) for dietary L-threonine levels of .39, .45, .51, .57, .63 and .69% were, respectively: 518, 371; 622, 426; 620, 422; 619, 439; 615, 429 and 594, 416. Spline regression analyses showed that the level of threonine needed to optimize average daily gain and gain/feed in the 16% protein sorghum-soybean meal grower diets was .47%.

Average daily gain and gain/feed (finishing experiment) resulting from dietary L-threonine levels of .29, .35, .41, .47, .53 and .59% were, respectively: 602, 219; 725, 244; 713, 242; 761, 237; 742, 241 and 807, 236. The level of threonine needed to optimize average daily gain and gain/feed in a 14% protein sorghum-soybean meal diet was .39 and .37%, respectively.

Footnotes

1 T. A. 13117, Texas Agricultural Experiment Station.

2 Department of Animal Science






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Copyright © 1977 by the American Society of Animal Science.