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Protein utilization during energy undernutrition in sheep sustained by intragastric infusion: effects of protein infusion level, with or without sub-maintenance amounts of energy from volatile fatty acids, on energy and protein metabolism

Published online by Cambridge University Press:  24 July 2007

S. A. Chowdhury ,
E. R. Ørskov ,
F. D. DeB. Hovell ,
J. R. Scaife  and
G. Mollison
S. A. Chowdhury
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB
F. D. DeB. Hovell
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB
J. R. Scaife
Affiliation:
School of Agriculture, University of Aberdeen, 581 King Street, Aberdeen AB9 IUD
G. Mollison
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB
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Abstract

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Utilization of endogenous and exogenous energy for protein accretion during energy undernutrition has been studied. Nine lambs nourished by intragastric infusion were given either progressively increasing or decreasing amounts of casein-N up to 2550 mg/kg metabolic weight (W0·75), with or without 250 kJ/kg W0·75 of volatile fatty acids daily. Energy balance (respiration calorimetry) and N balance were measured. While all experimental animals were in negative energy balance, N balance increased curve-linearly with the increase in casein-N infusion and attained positive N balance. Endogenous energy (presumably body fat) was found to meet the energy needs for protein accretion during energy undernutrition. It is concluded that body fat can be effectively utilized to support lean-tissue growth during energy undernutrition, so that the classical nutritional concept of dietary energy:protein ratio is only meaningful when both endogenous and exogenous energy are considered.

Keywords

Intragastric infusionEnergy undernutritionProtein utilizationFat mobilization
Type
Animal Nutrition
Information
British Journal of Nutrition , Volume 77 , Issue 4 , April 1997 , pp. 565 - 576
Copyright
Copyright © The Nutrition Society 1997

References

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