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Effect of season and photoperiod on the follicle-stimulating hormone receptors in a subtropical bird

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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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Authors and Affiliations

  1. Faculty of Integrated Arts and Sciences, Hiroshima University, 724, Higashi-Hiroshima, Japan

    K Tsutsui, S Kawashima, R N Saxena & S Ishii

  2. Zoological Institute, School of Science, University of Tokyo, 113, Tokyo, Japan

    S Kawashima

  3. Department of Zoology, University of Delhi, 110 007, Delhi, India

    R N Saxena

  4. Department of Biology, School of Education, Waseda University, 169, Tokyo, Japan

    S Ishii

Authors
  1. K Tsutsui
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  2. S Kawashima
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  3. R N Saxena
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  4. S Ishii
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Tsutsui, K., Kawashima, S., Saxena, R.N. et al. Effect of season and photoperiod on the follicle-stimulating hormone receptors in a subtropical bird. J. Biosci. 19, 485–489 (1994). https://doi.org/10.1007/BF02703184

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  • DOI: https://doi.org/10.1007/BF02703184

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