Czech J. Anim. Sci., 2008, 53(9):398-403 | DOI: 10.17221/337-CJAS
Effects of non-steroidal gonadal factors on LH secretion in female common carp during the reproductive cycle
- Department of Ichthyobiology and Fisheries, University of Agriculture in Krakow, Krakow, Poland
The aim of this study was to evaluate the effects of recombinant human inhibin A, recombinant human activin A and desteroidized ovarian extract on LH secretion in vitro and in vivo in female common carp during different stages of reproductive cycle. Inhibin stimulated spontaneous as well as GnRH-stimulated LH release in vivo in fish during gonadal recrudescence. This hormone did not have an influence on spontaneous LH secretion in the periovulatory period, but had a slightly inhibitory effect on GnRH-stimulated LH release in this stage of gonad maturity. Activin decreased spontaneous LH secretion during gonadal recrudescence and increased LH secretion before ovulation, having no effects on GnRH-stimulated LH release during both stages of gonad maturity. The desteroidized ovarian extract failed to modify spontaneous LH secretion, but decreased GnRH-stimulated LH release during recrudescence and especially before ovulation. It is to conclude that these data suggest the differential role of inhibin/activin as substances in the regulation of LH secretion in common carp females.
Keywords: inhibin; activin; ovarian extract; LH; common carp; aquaculture
Published: September 30, 2008 Show citation
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