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Effect of dietary protein level and thyroxine on vitamin A absorption and on plasma proteins in chicks

Published online by Cambridge University Press:  09 March 2007

I. Nir  and
I. Ascarelli
I. Nir
Affiliation:
Department of Animal Nutrition and Agricultural Biochemistry, Faculty of Agriculture, Hebrew University, Rehovot, Israel
I. Ascarelli
Affiliation:
Department of Animal Nutrition and Agricultural Biochemistry, Faculty of Agriculture, Hebrew University, Rehovot, Israel
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Abstract

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1. The effect of dietary protein level and supplementation with thyroxine on the liver storage of vitamin A, on the fraction of liver vitamin A in the alcohol form, and on the plasma levels of vitamin A and proteins has been studied in chicks.

2. Liver storage was reduced by lowering the dietary protein level.

3. Protein restriction lowered the percentage of vitamin A found in the liver as retinol.

4. Thyroxine increased both vitamin A storage and the fraction of the total vitamin A as retinol, this effect being dependent on dietary protein level.

5. Plasma vitamin A and plasma protein contents were lowered to a highly significant extent by protein restriction. This drop was essentially caused by reduction of the albumin fraction in chicks fed on a 5% protein diet and by a reduction of β- and γ-globulins in chicks fed on a 10% protein diet.

6. Thyroxine supplementation of the diet lowered to a highly significant extent plasma protein content; this reduction was caused by a dramatic fall in the level of plasma albumin. The β- and γ-globulins were concomitantly increased.

Type
Research Article
Information
British Journal of Nutrition , Volume 21 , Issue 1 , February 1967 , pp. 167 - 180
Copyright
Copyright © The Nutrition Society 1967

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