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The effects of cold exposure of pregnant sheep on foetal plasma nutrients, hormones and birth weight

Published online by Cambridge University Press:  09 March 2007

G. E. Thompson ,
J. M. Bassett ,
Debbie E. Samson  and
J. Slee
G. E. Thompson
Affiliation:
ARC Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
J. M. Bassett
Affiliation:
Nuffield Institute for Medical Research, Oxford OX3 9DS
Debbie E. Samson
Affiliation:
Animal Breeding Research Organization, Edinburgh EH9 3JQ
J. Slee
Affiliation:
Animal Breeding Research Organization, Edinburgh EH9 3JQ
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Abstract

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1. Five pregnant sheep, with indwelling catheters positioned for withdrawal of maternal right-atrial and foetal arterial blood, were exposed for 2 h to neutral and to cold (– 1° and wool-clipped) environmental temperatures. Acute maternal cold exposure increased the concentrations of glucose, glycerol and non-esterified fatty acids in maternal plasma and increased the concentration of glucose in foetal plasma, but not glycerol or non-esterified fatty acids. The concentration of corticosteroids in maternal piasma increased. The concent ration of corticosteroids in foetal plasma did not change but the concentration of insulin increased.

2. Thirteen pregnant sheep were housed at thermoneutrality and thirteen similar, sheep fed the same amount of food, were clipped and exposed to cold during the last 5– 6 weeks of pregnancy. Chronic maternal cold exposure increased the birth weight of both single and twin lambs.

3. It is concluded that exposure of pregnant sheep to cold can alter the partition of some nutrients between mother and foetus in favour of the foetus, and it is suggested how this may be brought about.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 48 , Issue 1 , July 1982 , pp. 59 - 64
Copyright
Copyright © The Nutrition Society 1982

References

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