The role of prolactin in the development of reproductive photorefractoriness and postnuptial molt in the European starling (Sturnus vulgaris)

Endocrinology
A Dawson, P J Sharp

Abstract

Seasonal breeding in many birds, including the European starling, is terminated by the development of absolute reproductive photorefractoriness, followed by a postnuptial molt, when photo-induced PRL secretion is at its seasonal maximum. To determine whether this photo-induced increase in PRL secretion has a causal role in the development of photorefractoriness or molt, European starlings were actively immunized against vasoactive intestinal polypeptide (VIP), the PRL releasing hormone in birds, or against PRL, during a photo-induced breeding cycle. In half of the VIP-immunized birds, the photo-induced increase in PRL was completely suppressed. Although these birds became photorefractory, the rate of gonadal regression was markedly slowed. These birds did not molt. In the remaining VIP-immunized birds, the photo-induced increase in PRL was inhibited but not completely suppressed. In these birds, and in those immunized against PRL, gonadal regression was also slowed, but molt progressed as normal. There were no significant differences in concentrations of plasma thyroxine between treatment and control groups, indicating that the effects of immunization on gonadal regression were not mediated by the induction of hypothyroidism. T...Continue Reading

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Citations

Dec 7, 2006·Biology Letters·Keith W SockmanThomas P Hahn
Mar 28, 2009·Proceedings. Biological Sciences·Marcel E VisserSamuel P Caro
Dec 1, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Alistair Dawson
Jan 1, 2008·The Veterinary Clinics of North America. Exotic Animal Practice·Christoph Mans, W Michael Taylor
Sep 2, 2008·General and Comparative Endocrinology·Sunantha KosonsirilukYupaporn Chaiseha
Jun 19, 2008·General and Comparative Endocrinology·John C Wingfield
Mar 21, 2007·General and Comparative Endocrinology·Alistair Dawson, Peter J Sharp
Sep 1, 2015·General and Comparative Endocrinology·Kristen M CovinoFrank R Moore
May 14, 2005·Annals of the New York Academy of Sciences·Peter J Sharp
Mar 15, 2006·General and Comparative Endocrinology·Alistair Dawson
Jan 24, 2006·General and Comparative Endocrinology·Seong W KangMohamed E El Halawani
Mar 9, 1999·General and Comparative Endocrinology·D L ManeyJ C Wingfield
Aug 17, 2001·Journal of Biological Rhythms·A DawsonG F Ball
Jun 22, 2018·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Anand S DixitNamram S Singh
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Mar 16, 2019·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·William A ButtemerSteffen Hahn
Apr 13, 2020·General and Comparative Endocrinology·Sydney F HopeWilliam A Hopkins
Oct 25, 2011·General and Comparative Endocrinology·Glenn T CrossinTony D Williams
May 11, 2012·The Journal of Experimental Biology·Maria A Echeverry-Galvis, Michaela Hau
Jul 29, 2011·The Journal of Experimental Biology·Jamie M CorneliusThomas P Hahn

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