Influence of photoperiod and 6-methoxybenzoxazolinone on the reproductive axis of inbred LSH/Ss Lak male hamsters

Journal of Reproduction and Fertility
H F UrbanskiM L Connolly

Abstract

Adult male Syrian hamsters of the inbred LSH/Ss Lak strain were maintained under a 14L:10D light cycle until 13 weeks of age. At this point, they were implanted s.c. with elastomer capsules that were either empty or packed with 30-40 mg of 6-methoxybenzoxazolinone (6-MBOA), a compound found naturally in some monocotyledonous plants; half of the animals from each treatment group were then kept in long days (14L:10D) or transferred to short days (9L:15D). Testicular size was measured and blood samples collected from each hamster immediately before capsule implantation and again 2, 4, 6 and 8 weeks later. Within just 2 weeks of exposure to short days the mean plasma levels of LH and FSH had significantly declined, in both the control and 6-MBOA-treated animals, and were basal within 4 weeks. Testicular size closely followed these gonadotrophin changes; within 4-6 weeks the testes from all of the short-day hamsters had completely regressed to a prepubertal size. At the end of the experiment, at Week 8, the animals were killed and various components of the hypothalamo-pituitary-testicular axis were compared between the treatment groups. The pituitary content of FSH and LH, testicular weight, mean serum level of testosterone, but not...Continue Reading

Citations

Apr 20, 2001·Brain Research. Molecular Brain Research·D I BrownH F Urbanski
Oct 22, 2009·The Journal of Comparative Neurology·Takayoshi UbukaGeorge E Bentley
Jun 17, 2014·General and Comparative Endocrinology· SurbhiVinod Kumar
Mar 27, 2003·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·George E BentleyThomas P Hahn
Jan 28, 2006·The Journal of Comparative Neurology·Chun-Chun Chen, Russell D Fernald
Jun 19, 2004·Archives of Andrology·I KusM Sarsilmaz

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