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Influence of Dietary Protein and Carbohydrate Levels on Liver Enzyme Activities in Quail¹

Department of Physiological Sciences, School of Veterinary Medicine, University of California, Davis, California 95616

Studies were conducted on the influence of dietary changes from a 25% casein, 63% glucose diet to an 88% casein, carbohydrate-free diet and vice versa on changes in liver composition and the activities of liver enzymes associated with amino acid metabolism, glycolysis, gluconeogenesis and lipogenesis in quail. The dietary change to the high protein diet resulted in decreases in liver glycogen, increases in the activities of enzymes associated with amino acid metabolism and gluconeogenesis and decreases in the activities of malic enzyme and phosphorylase. The reverse dietary change resulted in changes in these parameters in the opposite direction. Shorter half-lives were estimated for malic enzyme and glutamic-pyruvic transaminase in the quail than has been reported for the rat. Longer half-lives were estimated for both enzymes when measured during periods of induction of the enzyme as compared to those measured during periods when enzyme activity was decreasing. Consistent change in enzyme activity associated with dietary change was not observed for pyruvate kinase, L--glycerol phosphate dehydrogenase and citrate cleavage enzyme.

KEY WORDS: • liver • enzymes • dietary change

¹ Supported in part by USPHS research grant ES-00054 from the National Institutes of Arthritis and Metabolic Diseases.

² On sabbatical leave from Department of Animal Sciences, Purdue University, Lafayette, Indiana 47907.

Manuscript received 24 August 1972.

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