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

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      https://www.ias.ac.in/article/fulltext/jbsc/019/04/0485-0489

    • Keywords

       

      Follicle-stimulating hormone receptor; annual change; subtropical bird

    • 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.

    • Author Affiliations

       

      K Tsutsui1 S Kawashima1 2 R N Saxena1 3 S Ishii1 4

      1. Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima - 724, Japan
      2. Zoological Institute, School of Science, University of Tokyo, Tokyo - 113, Japan
      3. Department of Zoology, University of Delhi, Delhi - 110 007, India
      4. Department of Biology, School of Education, Waseda University, Tokyo - 169, Japan
    • Dates

       
  • Journal of Biosciences | News

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