Annual Changes in the Testis and Accessory Sex Organs of the Bullfrog Rana catesbeiana(Endocrinology)

概要

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In Rana catesbeiana active spermatogenesis and maximal development of sexual characters simultaneously occur in their annual changes. Spermatocytes were numerous in summer, especially in June. Prior to active spermatogenesis and development of sexual characters, 3β-HSD activity became most intense in the interstitial cells in May and June. This activity was also present in a weak form in the Sertoli cells and follicle cells from May to July. The size of the nuclei in the interstitial cells was greatest in April, and then gradually decreased. The development of the thumb pads was most remarkable in June and July, and the seminal vesicles were most developed in July. Blood levels of LH-like hormone and testosterone were highest in April and June, respectively.
1985-04-15