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The synthesis in vivo of proteins in various tissues in chickens adapted to intermittent feeding*

Published online by Cambridge University Press:  09 March 2007

Y. Pinchasov ,
I. Nir  and
Zafrira Nitsan
Y. Pinchasov
Affiliation:
Department of Animal Science, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76–100, Israel
I. Nir
Affiliation:
Department of Animal Science, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76–100, Israel
Zafrira Nitsan
Affiliation:
Department of Animal Science, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50–200, Israel
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Abstract

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1. Protein synthesis was estimated in vivo in breast (superficial pectoral) and tibia (gastrocnemius) muscles, liver, kidney, pancreas, crop, duodenum, jejunum and ileum, using L-[U-14C]lysine injection. The effect on incorporation of [14C]lysine 1 and 2 h after injection was examined in five chickens adapted or not adapted to intermittent feeding.

2. Incorporation of [14C]lysine into tissue decreased in magnitude in the following descending order: pancreas > jejunum, duodenum > ileum, crop, liver > kidney > tibia, breast muscle and blood plasma.

3. The incorporation of [14C]lysine into muscle protein was higher in chicks after 24 h of refeeding than after 24 h of food deprivation. These differences were higher in adapted than in non-adapted birds. On days of refeeding the rate of incorporation exceeded that found in chickens fed ad lib.

4. Bound 14C from lysine in the intestinal segments was less than in control birds after food deprivation and greater after refeeding in non-adapted chicks only.

5. A negative relation was observed between bound and free 14C in muscles and in other tissues.

6. Short- and long-term adaptations to feeding regimens are discussed.

Type
General Nutrition papers
Information
British Journal of Nutrition , Volume 60 , Issue 3 , November 1988 , pp. 517 - 523
Copyright
Copyright © The Nutrition Society 1988

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