Long-term reproductive cycles in rams after pinealectomy or superior cervical ganglionectomy

Journal of Reproduction and Fertility
G A LincolnG R Merriam

Abstract

Long-term cycles in diameter of the testes, colouration of the sexual skin and plasma concentrations of testosterone, FSH and prolactin were monitored in groups of pinealectomized (PINX), superior cervical ganglionectomized (SCGX), and control Soay rams living near Edinburgh (56 degrees N). In Exp. 1, PINX, SCGX and control rams were kept outside for 4 years, and well defined seasonal cycles in each of the reproductive parameters were evident in all 3 groups (e.g. testosterone cycle length assessed by sine-wave analysis: 12.08 +/- 0.17, 12.39 +/- 0.14 and 12.15 +/- 0.10 months for PINX, SCGX and control rams respectively). Qualitative differences, however, were apparent between the groups in the timing and amplitude of the reproductive cycle. The seasonal peak in reproductive function occurred from July to September in the PINX and SCGX rams, some 2 months earlier in the year than in controls, while the amplitude of the cycle was less marked in the PINX and SCGX rams. There were no significant differences between the experimental groups in the seasonal cycle in the plasma concentrations of prolactin. In Exp. 2, SCGX and control rams were kept indoors under an artificial environment with a 32-week light cycle and constant nutrit...Continue Reading

Citations

Nov 1, 1994·The Proceedings of the Nutrition Society·P J Morgan, J G Mercer
Dec 23, 2006·Science·Gerald A LincolnDavid G Hazlerigg
May 12, 2006·Chronobiology International·Gerald A Lincoln
Dec 3, 2014·Frontiers in Neuroendocrinology·Zachary M WeilRandy J Nelson
Apr 1, 2014·Physiology & Behavior·Stefanie MoneckeFranziska Wollnik
Jan 18, 2006·Animal Reproduction Science·M J Zamiri, A H Heidari
Dec 14, 1999·Clinical Endocrinology·M L ForslingA J Williams
Jun 1, 2002·Nutrition Research Reviews·S M RhindC L Adam
Jul 1, 1990·The Journal of Experimental Zoology·M BerriaR A Mead
Jun 19, 2001·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·G A LincolnI J Clarke
Aug 10, 2013·Journal of Biological Rhythms·Stefanie MoneckePaul Pévet
May 5, 2021·Journal of Neuroendocrinology·Francis J P EblingAndrew S I Loudon

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