J. Anim Sci.
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J. Anim Sci. 1985. 60:480-486.
© 1985 American Society of Animal Science
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Threonine Requirement of Pigs Weighing 5 to 15 kg and the Effect of Excess Methionine in Diets Marginal in Threonine1

V. L. Rosell and D. R. Zimmerman2

Iowa Agriculture and Home Economics Experiment Station, Ames 50011

Abstract

Experiments were conducted to estimate the threonine requirement of pigs weighing 5 to 15 kg and to determine whether excess methionine increased the threonine requirement. Feeding .70% dietary threonine in Exp. 1 maximized (P<.01) gain/feed and minimized (P<.01) plasma urea N. Plasma threonine was increased (P<.01) by threonine supplementation and the rate of increase accelerated above .65% dietary threonine. Threonine supplementation did not affect plasma methionine, tryptophan and(or) lysine, but it increased leucine (P<.01) and isoleucine (P<.05). In Exp. 2, additions of .40% methionine and(or) .30% threonine to a 16% crude protein diet that had calculated concentrations of .57% sulfur amino acids and .68% threonine did not affect (P>.10) pig performance or plasma urea N. In Exp. 3, a 15% crude protein diet that had calculated concentrations of .54% sulfur amino acids and .61% threonine was supplemented with .40% methionine and(or) .15% threonine. Amino acid additions did not affect performance of pigs, but pigs fed supplemental threonine had the least plasma urea N, indicating that .61% dietary threonine was marginally deficient for pigs weighing 5 to 15 kg.

Footnotes

1 Journal Paper No. J-11443 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 2356.

2 Dept. of Anim. Sci.






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