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Studies on the Competitive Absorption of Neutral L-Amino Acids from the Avian Small Intestine^{1, 2,}

Department of Animal and Veterinary Sciences, University of Maine, Orono, Maine 04473

This study investigated the competition of neutral amino acids in the absorptive process in the small intestine of the chicken and the effect of mild protein restriction upon this competition. It was shown that competition for transport does exist among neutral amino acids in the chicken gut. Methionine and leucine inhibited alanine and glycine transport but had little effect on the transport of -aminoisobutyric acid (AIB). Of the three amino acids tested, the order of transport rates was: alanine > glycine > AIB. The effect of dietary protein levels on the competition for transport was minimal under the conditions used in this study.

KEY WORDS: • absorption • transport • amino acid • protein

¹ Supported in part by Hatch Project 173, Maine Agricultural Experiment Station and by a National Defense Education Act Fellowship.

² Adapted from a Ph.D. Thesis submitted by Harland E. Sheerin to the Graduate School, University of Maine, Orono, Maine, June, 1971.

³ Present address: Gastrointestinal Unit, Department of Medicine, Harvard Medical School, Beth Israel Hospital, Boston, Mass. 02215.

Manuscript received 23 March 1972.