Annual Patterns of Testicular Development and Activity in the Chinese Bullfrog : Rana rugulosa Wiegmann

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概要

• 論文の詳細を見る

• Annual patterns of testicular development and of testicular and plasma androgen levels in the Chinese bullfrog, Rana rugulosa Wiegmann, are reported. The animals were collected from a frog culture farm from November of 1986 through November of 1987, at monthly intervals or more frequently during the breeding season. Proliferation of primary spermatogonia was observed in November-December. In January-February, the number of primary spermatogonia decreased while secondary spermatogonia increased. Primary and secondary spermatocytes showed little changes until February when their number rose sharply. Although every stage of spermatogenesis was present year around, spermatozoa were massively formed in April-June. Thus, the spermatogenetic cycle of R. rugulosa, inhabiting subtropical Taiwan, is of continuous type. Leydig cells began to proliferate in late March and were abundant from April through July. Testicular androgen content showed basal values in January-February and August-December, began to increase in late March, peaked in April, and dropped markedly in May. The pattern of plasma androgen levels was similar to that of testicular androgen content, except peaking in middle April-early May and dropped in late June. The unimodal pattern of seasonal changes in plasma androgen levels parallels Leydig cell proliferation, spermatogenesis, testicular androgen content, and reproductive activities. In addition, the testicular weight was negatively correlated with liver weight, but not with fat body weight during an annual reproductive cycle of R. rugulosa.

• 社団法人日本動物学会の論文
• 1993-04-15

著者

• YANG Cheng

  Department of Biochemistry, Fukui Medical School

• Yu Yuh-lin

  Endocrinology Laboratory Institute Of Zoology Academia Sinica Nankang Taipei

• Kao Yung-hsi

  Endocrinology Laboratory Institute Of Zoology Academia Sinica Nankang Taipei:department Of Biology T

• Alexander S.

  Department of Biology, Tunghai University

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