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PHOTOPERIOD: AN IMPORTANT REGULATOR OF PLASMA PROLACTIN CONCENTRATION IN FETAL LAMBS DURING LATE GESTATION
Author(s) -
Bassett J. M.,
Bomford J.,
Mott J. C.
Publication year - 1988
Publication title -
quarterly journal of experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0144-8757
DOI - 10.1113/expphysiol.1988.sp003138
Subject(s) - prolactin , gestation , fetus , endocrinology , medicine , photoperiodism , biology , pregnancy , hormone , genetics
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.
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