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.
| Original language | English |
|---|---|
| Pages (from-to) | 485-489 |
| Number of pages | 5 |
| Journal | Journal of Biosciences |
| Volume | 19 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1994 Oct |
| Externally published | Yes |
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Keywords
- annual change
- Follicle-stimulating hormone receptor
- subtropical bird
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Biochemistry, Genetics and Molecular Biology(all)
Cite this
Effect of season and photoperiod on the follicle-stimulating hormone receptors in a subtropical bird. / Tsutsui, Kazuyoshi; Kawashima, S.; Saxena, R. N.; Ishii, S.
In: Journal of Biosciences, Vol. 19, No. 4, 10.1994, p. 485-489.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of season and photoperiod on the follicle-stimulating hormone receptors in a subtropical bird
AU - Tsutsui, Kazuyoshi
AU - Kawashima, S.
AU - Saxena, R. N.
AU - Ishii, S.
PY - 1994/10
Y1 - 1994/10
N2 - 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.
AB - 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.
KW - annual change
KW - Follicle-stimulating hormone receptor
KW - subtropical bird
UR - http://www.scopus.com/inward/record.url?scp=51249163525&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=51249163525&partnerID=8YFLogxK
U2 - 10.1007/BF02703184
DO - 10.1007/BF02703184
M3 - Article
AN - SCOPUS:51249163525
VL - 19
SP - 485
EP - 489
JO - Journal of Biosciences
JF - Journal of Biosciences
SN - 0250-5991
IS - 4
ER -