PMID: 2509614Sep 1, 1989Paper

Effects of altered photoperiod or maternal melatonin administration on plasma prolactin concentrations in fetal lambs

The Journal of Endocrinology
J M BassettC M Weeding

Abstract

During winter (December to March), when late-pregnant ewes were maintained under an artificial long-day photoperiod (16 h light) for 3 weeks or more before insertion of fetal vascular cannulae between 118 and 120 days of gestation (full term, 147 days), plasma prolactin concentrations in their fetal lambs were significantly increased throughout the last 3 weeks of gestation in comparison with values in similar aged fetuses from ewes experiencing only the natural short-day (less than 9 h light) winter photoperiod. When additional lighting was given only after vascular cannulation, fetal plasma prolactin increased steadily from low values, characteristic of winter pregnancies, to high values, characteristic of long-day (16 h light:8 h darkness) pregnancies. Maternal plasma prolactin concentrations changed in a similar way. During summer pregnancies (greater than 16 h light), plasma prolactin in fetal lambs was significantly reduced within 48 h when ewes were given melatonin by i.v. infusion for 14 h each night to simulate the winter duration of the nocturnal increase in plasma melatonin. Maternal plasma prolactin concentrations also decreased significantly when melatonin was given for 3 weeks, but not in a shorter experiment. Inc...Continue Reading

Citations

Jan 1, 1991·Pharmacology & Therapeutics·M H Hastings
Feb 1, 1994·Neurochemistry International·P J MorganR Helliwell
Jul 1, 1997·Animal Reproduction Science·R J HelliwellJ J Robinson
Dec 18, 2010·Progress in Biophysics and Molecular Biology·Michael E SymondsMichael A Lomax
Mar 1, 1994·The Proceedings of the Nutrition Society·C L Adam, J J Robinson
Sep 26, 2003·The Proceedings of the Nutrition Society·S PearceM E Symond
Jun 1, 1996·Journal of Dairy Science·H BarashJ I Weller
Jul 19, 2017·Proceedings of the National Academy of Sciences of the United States of America·Cristina Sáenz de MieraDavid Hazlerigg
Oct 4, 2000·Physiological Reviews·M E FreemanG Nagy
Oct 23, 2002·Journal of Pineal Research·Louise ThomasLynda M Williams

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