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Effect of dietary composition and cold exposure on non-shivering thermogenesis in young pigs and its alteration by the β-blocker propranolol

Published online by Cambridge University Press:  08 December 2008

M. J. Dauncey  and
D. L. Ingram
M. J. Dauncey
Affiliation:
ARC Institute of Animal Physiology and MRC Dunn Calorimetry Group, Rabraham, CambridgeCB2 4AT
D. L. Ingram
Affiliation:
ARC Institute of Animal Physiology and MRC Dunn Calorimetry Group, Rabraham, CambridgeCB2 4AT
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Abstract

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1. Young pigs were fed on three diets consecutively, each diet being given for 1 week. The diets were given in random order as (g pig feed/kg body-weight): (a) 20, (b) 60, (c) 20 plus a supplement with the energy equivalent of 40 g pig feed/kg. The supplements included desiccated coconut, fish meal and glucose.

2. At the end of each week resting metabolic rate, beginning 12–14 h after feeding, was measured overnight using an open-circuit respiration chamber at thermoneutrality.

3. The oxygen consumption of pigs on the 60 g/kg diet was always higher than on the 20 g/kg diet. The addition of desiccated coconut, or fish meal also increased metabolic rate; whereas with added glucose, O2 consumption tended to be even lower than on 20 g/kg alone.

4. The administration of the β-blocker propranolol to pigs on ad lib. food intake reduced the rate of overnight resting O2 consumption, measured from 10 until 20 h after feeding, by 12%, but it had no effect on O2 consumption when the intake was 20 g feed/kg. Exposure to mild cold (15°) caused an increase in O2 consumption and this was reduced by 14% after injection of propranolol.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 41 , Issue 2 , March 1979 , pp. 361 - 370
Copyright
Copyright © The Nutrition Society 1979

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