Prenatal photoperiod influences neonatal prolactin secretion in the sheep

Endocrinology
F J EblingD L Foster

Abstract

This study tested the hypothesis that the fetal sheep can respond to photoperiod cues. Pregnant Suffolk ewes were maintained in artificial photoperiod of either long days [16 h of light, 8 h of dark (16L:8D)] or short days (8L:16D) from approximately 100 days of gestation until term at approximately 147 days. On the day of birth, all lambs and their mothers were transferred to an intermediate photoperiod of 12L:12D; both groups were housed together. To provide an index of response to photoperiod, serum PRL concentrations were measured in blood samples collected daily 3-4 h after lights on. In lambs (n = 8 male; n = 7 female) born to mothers on long days, serum PRL concentrations were high (greater than 200 ng/ml) for the first few days after birth, but fell rapidly to low levels (less than 50 ng/ml) within 14 days postnatally in 12L:12D. Conversely, lambs (n = 8 male; n = 7 female) born to mothers on short days initially had low PRL concentrations, but these gradually increased in the postnatal 12L:12D photoperiod to 150 ng/ml by 32 days of age. Thus, serum PRL concentrations in lambs at birth reflect the photoperiodic treatment of their mother, and the subsequent PRL response to an intermediate photoperiod of 12L:12D depends o...Continue Reading

Citations

Feb 1, 1994·Neurochemistry International·P J MorganR Helliwell
Dec 23, 2003·Immunology Letters·Diomira LuongoMauro Rossi
Jul 1, 1997·Animal Reproduction Science·R J HelliwellJ J Robinson
Apr 18, 2003·Biology of Reproduction·Karen D CarpenterThomas E Spencer
Jul 5, 2013·Proceedings. Biological Sciences·Barbara HelmDavide Dominoni
Oct 15, 1989·Experientia·F J Ebling, D L Foster
Mar 1, 1994·The Proceedings of the Nutrition Society·C L Adam, J J Robinson
Aug 16, 2011·Molecular and Cellular Endocrinology·María Serón-FerréClaudia Torres-Farfan
Oct 30, 2007·Birth Defects Research. Part C, Embryo Today : Reviews·Maria Seron-FerreClaudia Torres-Farfan
Jun 14, 2013·Genes to Cells : Devoted to Molecular & Cellular Mechanisms·Kaori TsujinoHiroki R Ueda
Oct 24, 2001·Biology of Reproduction·C A GrayT E Spencer
Dec 19, 2002·Endocrinology·Karen D CarpenterThomas E Spencer
May 7, 2019·Journal of Neuroendocrinology·Hugues DardenteCristina Sáenz de Miera
Oct 23, 2002·Journal of Pineal Research·Louise ThomasLynda M Williams
Jul 26, 2006·Journal of Animal Science·S R NiekampJ L Salak-Johnson
Jan 31, 2020·Frontiers in Endocrinology·Jayme van DalumDavid G Hazlerigg
Oct 4, 2000·Physiological Reviews·M E FreemanG Nagy
Jul 19, 2017·Proceedings of the National Academy of Sciences of the United States of America·Cristina Sáenz de MieraDavid Hazlerigg

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