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Protein turnover in growing pigs. Effects of age and food intake

Published online by Cambridge University Press:  09 March 2007

P. J. Reeds ,
A. Cadenhead ,
M. F. Fuller ,
G. E. Lobley  and
J. D. McDonald
P. J. Reeds
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
A. Cadenhead
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
M. F. Fuller
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
G. E. Lobley
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
J. D. McDonald
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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1. Measurements were made of the nitrogen and energy balances of pigs of 30, 60 and 90 kg given a conventional diet at various daily rates.

2. Body protein synthesis was estimated from the irreversible loss of leucine from the blood following the infusion of [1-14C]leucine, and from the oxidation of the labelled amino acid.

3. Protein synthesis (g/d) increased by 2.17 for each 1 g increase in daily protein accretion and by 1.55 for each 1 g increase in daily protein intake.

4. At 30 kg, pigs close to energy equilibrium synthesized 270 g protein daily compared with 406 g and 512 g when their ration supplied twice and three times their maintenance requirement.

5. There was a close correlation between the daily urinary excretion of urea + ammonia and total amino acid catabolism estimated from the catabolism of leucine, but the latter underestimated the observed excretion by 2.5 g N/d.

6. The results imply that protein turnover accounts for only a proportion of the heat production associated with protein deposition.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 43 , Issue 3 , May 1980 , pp. 445 - 455
Copyright
Copyright © The Nutrition Society 1980

References

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