Effect of season and photoperiod on the follicle stimulating.
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Date
1994-10
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Abstract
Annual changes in and photoperiodic influence oh the weight of gonads, a
parameter of gonadal activity, are much smaller in female birds than in males. Effect of
season and photoperiod on the follicle-stimulating hormone receptors in the testis or ovary
was studied using a subtropical weaver finch. The number of follicle-stimulating hormone
binding sites per unit testicular weight showed a peak in the non-breeding phase; while
the total number of binding sites per two testes was maximal in the breeding phase and
minimal in the regressive phase. In contrast, seasonal changes in follicle-stimulating hormone
binding sites in the ovary were less marked. Exposure to short-day during the breeding
phase induced marked decreases in the numbers of binding sites per unit testicular weight
and per two testes. These numbers markedly increased after transfer to long-day during
the non-breeding phase. However, there was no significant effect of short-day or long-day
exposure on follicle-stimulating hormone binding sites in the ovary. These results suggest
that photoperiod is an effective environmental factor in the regulation of follicle-stimulating
hormone receptors in the testis and the effect is manifested by pronounced changes in the
testicular weight during annual breeding cycle.
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Keywords
Follicle-stimulating hormone receptor, annual change, subtropical bird
Citation
Tsutsui K, Kawashima S, Saxena R N, Ishili S. Effect of season and photoperiod on the follicle stimulating. Journal of Biosciences. 1994 Oct; 19(4): 485-489.