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Quarterly Journal of Experimental Physiology 73.2 pp 241-244
© The Physiological Society 1988
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PHOTOPERIOD: AN IMPORTANT REGULATOR OF PLASMA PROLACTIN CONCENTRATION IN FETAL LAMBS DURING LATE GESTATION

J. M. Bassett 1, J. Bomford 1, and J. C. Mott 1

1 University of Oxford, Growth and Development Unit, University Field Laboratory, Wytham, Oxford OX2 8RJ

Measurement of prolactin (PRL) at 120-140 days gestation in chronically-cannulated fetal lambs and their mothers during hormonally-extended breeding seasons shows that photoperiod is a major determinant of PRL secretion in the fetal lamb as well as in its mother. About 80% of the variance between fetuses in plasma PRL concentration is associated with variation in ambient photoperiod. The magnitude of this effect far exceeds the range of previously reported diurnal or ontogenetic changes in PRL in the fetal lamb.

Submitted on December 7, 1987
Accepted on December 14, 1987




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