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The effects of plane of nutrition and environmental temperature on the energy metabolism of the growing pig

3*. The efficiency of energy utilization for maintenance and growth

Published online by Cambridge University Press:  09 March 2007

W. H. Close
W. H. Close
Affiliation:
ARC Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
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Abstract

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1. From the relation between metabolizable energy (me) intake and heat loss (H), energy retention (ER), protein (P) and fat (F) deposition the energy costs of maintenance (MEm) and the partial efficiencies of energy retention (k) and protein (kp) and fat (kf) retention were determined in growing pigs at environmental temperatures of 10, 15, 20, 25 or 30°.

2. k decreased with increase in environmental temperature from 0.79 at 10° to 0.63 at 30° with 0.67 at the thermally-neutral temperature of 25°. Each 0.04 decrease in k was associated with a 100 kJ/kg0.75 per d decrease in mem Analysis, within several ranges of environmental temperature, suggested a curvilinear relation between ER and me intake indicating a decrease in k with increase in level of feeding, particularly at thermally-neutral temperatures.

3. Both kp and kf were similar at each environmental temperature and decreased from 0.78 at 10° to 0.63 at 30°. These values are discussed in relation to those predicted from experimentation and it is suggested that the wide range of predicted estimates of kp could be attributed to differences in the rate of protein turnover.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 40 , Issue 3 , November 1978 , pp. 433 - 438
Copyright
Copyright © The Nutrition Society 1978

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