J. Anim Sci.
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J. Anim Sci. 1984. 59:135-140.
© 1984 American Society of Animal Science
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Effects of Graded Levels of Lysine and Excess Arginine and Threonine on Young Pigs Fed Practical Diets1

V. L. Rosell and D. R. Zimmermann2

Iowa Agriculture and Home Economics Experiment Station, Ames 50011

Abstract

Three experiments were conducted to estimate the lysine requirement of the weanling pig and the effects of excess arginine and threonine on- that estimate. Feeding 1.15% dietary lysine in Exp. 1 and 1.20% in Exp. 2 maximized feed efficiency and resulted in the lowest plasma urea N values. Adding .15% threonine to the diets in Exp. 2 did not affect (P>.10) performance of the pigs, but increased (P<.01) plasma urea N and decreased (P<.01) plasma lysine concentrations. Supplemental arginine (.22%) did not affect performance of the growing pigs in Exp. 3, but it increased (P<.01) plasma urea N. Pigs fed a corn-soybean meal diet utilized feed more efficiently (P<.05) than those fed a corn-fish meal-dried whey diet. The most likely cause for this response was that the corn-soybean diet contained more lysine (.82%) than expected, whereas the corn-fish meal-dried whey diet had close to the expected content of lysine (.72%). From these results, it was concluded that the lysine requirement of the weanling pig fed practical diets is at least 1.15 or 1.20% of the diet. Also, added arginine or threonine did not adversely affect the performance of pigs.

Footnotes

1 Journal Paper No. J-11196 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 2356.

2 Dept. of Anim. Sci.






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Copyright © 1984 by the American Society of Animal Science.