J. Anim Sci.
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J. Anim Sci. 1975. 40:871-874.
© 1975 American Society of Animal Science
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Glutamic Acid and Tryptophan Additions to a Low-Protein Pig Starter1

Dean R. Zimmerman

Iowa Agriculture and Home Economics Experiment Station2, Ames, 50010

Abstract

Two feeding trials with baby pigs were conducted to evaluate the effects of additions of L-tryptophan and L-glutamic acid to a low protein (16%) starter diet on performance and plasma urea nitrogen, {alpha}-amino nitrogen and free tryptophan. In experiment 1, but not in experiment 2, glutamic acid addition (3.36%) improved rate of gain and feed efficiency. Tryptophan addition did not improve performance in either experiment. Plasma tryptophan data in both experiments indicated that the tryptophan level and availability were adequate in the low-protein diet. The response to glutamic acid suggests inadequate levels of dispensable amino acids for the baby pig in the low-protein basal diet.

Footnotes

1 Journal Paper No. J-7955 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 2021.

2 Department of Animal Science.






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Copyright © 1975 by the American Society of Animal Science.