Relationship between Serum Sex Hormone Concentrations and Histology of Seminiferous Tubules of Captured Baleen Whales in the Western North Pacific during the Feeding Season
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- WATANABE Hiroyuki
- Department of Animal Production Science, Obihiro University of Agriculture and Veterinary Medicine
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- MOGOE Toshihiro
- The Institute of Cetacean Research
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- ASADA Masatsugu
- Department of Animal Production Science, Obihiro University of Agriculture and Veterinary Medicine
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- HAYASHI Kengo
- Department of Agricultural and Life Science, Obihiro University of Agriculture and Veterinary Medicine
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- FUJISE Yoshihiro
- The Institute of Cetacean Research
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- ISHIKAWA Hajime
- The Institute of Cetacean Research
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- OHSUMI Seiji
- The Institute of Cetacean Research
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- MIYAMOTO Akio
- Department of Agricultural and Life Science, Obihiro University of Agriculture and Veterinary Medicine
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- FUKUI Yutaka
- Department of Animal Production Science, Obihiro University of Agriculture and Veterinary Medicine
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The present study was conducted to obtain new information on relationships among serum testosterone (T), estradiol-17 β (E2), follicle-stimulating hormone (FSH), and luteinizing hormone (LH) concentrations and histology of seminiferous tubules in captured common minke and Bryde’s whales during the feeding season. Blood samples and testes were collected from common minke (n=39 for blood samples, n=15 for testes) and Bryde’s (n=14 for blood samples, n=7 for testes) whales captured from May 2001 to August 2001 in the Western North Pacific. Serum T concentrations, in 35.9% of the common minke and 57.1% of Bryde’s whales, were below the detection limit (< 2.5 pg/ml). There were no significant differences in the serum concentrations of E2, FSH, and LH among immature, mature common minke and Bryde’s whales except that LH levels of immature Bryde’s whales was higher than those of common minke whales. In most seminiferous tubules of mature whales, only a single-layer of spermatogonia was observed. However, spermatozoa were observed in seminiferous tubules in 2/13 of mature common minke and 4/4 of mature Bryde’s whales with the low or undetectable T levels. These results indicate that the low serum T concentrations reflect the inactivity of spermatogenesis in both baleen whales, and that it is not possible to assess gonadal activity in either common minke or Bryde’s whales using serum sex hormone concentrations during the feeding season.<br>
収録刊行物
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- Journal of Reproduction and Development
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Journal of Reproduction and Development 50 (4), 419-427, 2004
公益社団法人 日本繁殖生物学会
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詳細情報
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- CRID
- 1390001206337207936
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- NII論文ID
- 10027322866
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- NII書誌ID
- AA10936678
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- COI
- 1:CAS:528:DC%2BD2cXpvFant70%3D
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- ISSN
- 13484400
- 09168818
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- NDL書誌ID
- 7044701
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- PubMed
- 15329473
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可