Annual cycle of spermatogenesis and testis morphology in woodchucks.
Annual cycle of spermatogenesis and testis morphology in woodchucks.
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土拨鼠精子发生和睾丸形态的年度周期。
DOI：
10.2307/1379209
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发表时间：
1972
影响因子：
1.7
通讯作者：
T. Mckinney
中科院分区：
文献类型：
--
作者：
J. J. Christian;E. Steinberger;T. Mckinney
对宾夕法尼亚州中部土拨鼠睾丸进行组织学检查，以确定季节和年龄对形态和精子发生活性的影响。生精活动和曲细精管的大小是最大的成年人在冬眠出现的时间在2月和秋季最少。成熟耗尽和平均睾丸重量的下降是明显的生殖活动期间之前，在3月。平均睾丸重量的下降速度低于小管大小和生精活性，这显然是由于随着小管大小的减小，间质组织增加。成熟精子出现在一些一岁鸽的睾丸在冬眠的时候出现。然而，大多数男性可能在2岁时性成熟。在每个月到5月，一些一岁鸽往往比其他人更成熟的性，证明了在已知年龄的动物精子发生的积极进展和退化。
Testes of woodchucks in central Pennsylvania were examined histologically to determine effects of season and age on morphology and spermatogenic activity. Spermatogenic activity and size of the seminiferous tubules were greatest in adults at the time of emergence from hibernation in February and least during autumn. Maturation depletion and a decline in mean testes weight were evident prior to the period of reproductive activity in March. Mean testes weight declined less rapidly than did tubule size and spermatogenic activity, apparently due to an increase in interstitial tissue as tubule size dimished. Mature spermatozoa were present in testes of some yearlings at the time of emergence from hibernation. However, most males probably mature sexually at 2 years of age. During each month through May, some yearlings tended to mature sexually more than others, as evidenced by active progression and degeneration of spermatogenesis in known-age animals.