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Threonine Metabolism of Chicks Fed Threonine-Imbalanced Diets

Alan T. Davis1 and Richard E. Austic

Department of Poultry and Avian Sciences and Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853

Experiments were conducted to determine the metabolic fate of threonine in chicks fed threonine-imbalanced diets. Threonine imbalance was produced by the addition of 3% serine to a threonine-limiting diet, and prevented by the addition of 0.2% threonine to the diet. Serine decreased plasma and liver free threonine concentrations, and increased hepatic threonine dehydrogenase and threonine aldolase activities. All changes, including reduced food intake, appeared to occur within 1 day of feeding the imbalanced diet. Despite the decrease in free threonine concentrations and the increase in threonine aldolase and threonine dehydrogenase activities, net threonine catabolism was not markedly increased. This was evidenced by similar amounts of 14CO2 exhaled by chicks fed control and imbalanced diets containing L-[U-14C]threonine, and by similar growth of chicks that were force-fed both diets to maintain equivalent food intake. It is possible that increases in threonine catabolism contribute to depressions of plasma and tissue threonine concentrations. However, the growth depression caused by serine-induced threonine imbalance is due to depressed food intake.

KEY WORDS: • threonine • serine • imbalance • chicks • threonine catabolism • enzymes

1 Present address: Medical Research, Room K106, Veterans Administration Hospital, 10701 East Blvd., Cleveland, OH 44106.

Manuscript received 12 July 1982.




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Copyright © 1982 by American Society for Nutrition