Experimental Physiology
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Quarterly Journal of Experimental Physiology 71.1 pp 93-98
© The Physiological Society 1986
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COLD EXPOSURE AND MAMMARY EXCHANGES OF CIRCULATING THYROXINE AND OESTRONE SULPHATE IN THE GOAT

J. Goode 1 and G. E. Thompson 1

1 Institute of Animal Physiology, Babraham, Cambridge CB2 4AT

The effects of cold exposure on arterial and mammary venous concentrations of thyroxine and oestrone sulphate, and on mammary blood flow, were measured in goats during different stages of pregnancy and lactation. There were no significant differences in net mammary uptake of thyroxine in four non-pregnant lactating goats exposed for 30 h to cold (-3 ± 2° C) or control (20 ± 2 °C) temperatures. Cold exposure for 30 h of six lactating goats (approximately 85 d pregnant) stimulated a net mammary release into the circulation of oestrone sulphate (mean 294 ng/min); plasma cortisol concentrations also increased. Cold exposure at approximately 30 d of pregnancy increased cortisol concentrations but had no effect on release of oestrone sulphate.

Submitted on June 17, 1985






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Copyright © 1986 by the The Physiological Society.