Seasonal and photoperiodic regulation of secretion of hormones associated with reproduction in Magang goose ganders

Domestic Animal Endocrinology
Z D ShiR C Yu

Abstract

This study examined the reproductive endocrine profile under natural and artificial photoperiods in Magang goose ganders. Group 1 ganders (n=8) served as non-treated controls and were exposed to natural photoperiod throughout the experiment from 13th January to 17th December 2004. Group 2 ganders (n=8) were exposed to 18 h long daily photoperiod for 60 days from 13 January till 15 March 2004 and again to 16 h photoperiod for 75 days till 10th October 2004, and the 11h short photoperiod in the remainder periods of the experiment. In control ganders, plasma LH concentrations were high in normal breeding seasons (August-March) and decreased to low levels in non-breeding season from April to July. Testosterone concentrations changed similarly to that of LH throughout the seasons. Seasonal pattern of PRL concentrations was opposite to those of LH and testosterone, with low values in breeding season and high values in non-breeding season. In artificial photoperiod treated ganders, increasing photoperiod increased PRL and decreased LH and testosterone concentrations, while decreasing photoperiod reversed these changes. There were no seasonal or photoperiod caused changes in plasma T3 concentrations in both control ganders and artifici...Continue Reading

References

Jan 1, 1992·Reproduction, Fertility, and Development·J D Curlewis
Oct 1, 1989·The Journal of Endocrinology·R G Dyer, J E Robinson
Nov 13, 2001·General and Comparative Endocrinology·K GahaliI Rozenboim
May 29, 2003·Canadian Journal of Physiology and Pharmacology·Peter J Sharp, Dominique Blache

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Citations

Feb 28, 2016·Animal Reproduction Science·Shen-Chang ChangSan-Yuan Huang
Sep 1, 2015·Theriogenology·Małgorzata Gumułka, Israel Rozenboim
Jul 23, 2014·Asian-Australasian Journal of Animal Sciences·Xinhong LuanShuwei Zhang
Jun 16, 2007·General and Comparative Endocrinology·Z LiuB H Yao
Feb 11, 2018·Animal Biotechnology·Zi-Xuan ZhuangSan-Yuan Huang
Sep 22, 2012·Violence Against Women·Molly Dragiewicz, Walter S Dekeseredy
Jun 23, 2021·Zygote : the Biology of Gametes and Early Embryos·Huiliang XueLaixiang Xu
Aug 28, 2021·Animals : an Open Access Journal From MDPI·Małgorzata GumułkaIsrael Rozenboim

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