Stress inhibits seasonal and FSH-induced ovarian recrudescence in the lizard,Mabuya carinata

Ganesh, C. B. and Yajurvedi, H. N. (2002) Stress inhibits seasonal and FSH-induced ovarian recrudescence in the lizard,Mabuya carinata. Journal of Experimental Zoology, 292 (7). pp. 640-648. ISSN 1097-010X

Text (Full Text) Stress Inhibits Seasonal and FSH.pdf - Published Version Restricted to Registered users only Download (914kB) | Request a copy

Abstract

Abstract Stressors (handling, chasing, and noise) applied randomly five times per day for one month to lizards during the recrudescence phase of the ovarian cycle caused a significant reduction in mean number of oocytes and primordial follicles when compared to those of controls. Further, vitellogenic follicles were absent in the ovary of lizards subjected to stressors. Administration of bovine FSH during post-breeding regression phase of the ovarian cycle induced ovarian recrudescence as shown by significant increases in the mean number of oogonia, oocytes, and primordial follicles compared to controls, as well as vitellogenic growth of follicles. However, lizards treated with FSH and exposed to stressors did not exhibit ovarian recrudescence. Furthermore, FSH administration during the post-breeding regression phase caused a significant increase in serum levels of estradiol compared to controls, which was accompanied by significant increases in the relative weight of the liver and oviduct, as well as vitellogenic growth of follicles. Despite administration of FSH to lizards subjected to stressors, there was neither any increase in serum levels of estradiol and weight of the liver nor vitellogenic growth of follicles. The results indicate that repeated application of stressors inhibits vitellogenic growth of follicles by suppression of steroidogenic activity in M. carinata. This is the first report revealing that the ovary does not respond to gonadotrophin treatment under stressful conditions in reptiles. J. Exp. Zool. 292:640–648, 2002. © 2002 Wiley-Liss, Inc.

Item Type:	Article
Subjects:	B Life Science > Zoology
Divisions:	Department of > Zoology
Depositing User:	Manjula P Library Assistant
Date Deposited:	23 Sep 2019 09:54
Last Modified:	23 Sep 2019 09:54
URI:	http://eprints.uni-mysore.ac.in/id/eprint/8378

Actions (login required)

View Item