Sisk C L, Turek F W
J Androl. 1987 Mar-Apr;8(2):91-6. doi: 10.1002/j.1939-4640.1987.tb00956.x.
The development of the reproductive response to short photoperiod in golden hamsters was examined by monitoring testis size in hamsters that were either: raised on 14L:10D from birth; raised on 6L:18D from birth; or born on 14L:10D and transferred to 6L:18D at either 1, 2, 3, 4, 5, 6, 7, 9, or 12 weeks of age. Testis growth occurred between 3 and 7 weeks of age at similar rates in all groups. Testicular regression occurred in all groups exposed to short days; the time of regression depended on the age of the animals when they were first transferred to 6L:18D. Testicular regression began at about 10 weeks of age in all groups transferred to 6L:18D between birth and 5 weeks of age. In contrast, regression began at 11.2, 13.3, 15.6, and 18.2 weeks of age in hamsters transferred to 6L:18D at 6, 7, 9, and 12 weeks of age, respectively. These results suggest that the reproductive system of male hamsters is refractory to the inhibitory effects of short days on reproductive function until 5 to 6 weeks of age. Thereafter, exposure to short days initiates testicular regression in hamsters within 5 to 7 weeks.
通过监测处于以下条件的仓鼠的睾丸大小，研究了金黄仓鼠对短光照周期生殖反应的发育情况：从出生起饲养在14小时光照：10小时黑暗（14L:10D）条件下；从出生起饲养在6小时光照：18小时黑暗（6L:18D）条件下；或出生在14L:10D条件下，并在1、2、3、4、5、6、7、9或12周龄时转移到6L:18D条件下。所有组的睾丸在3至7周龄之间以相似的速度生长。所有暴露于短日照的组均出现睾丸退化；退化时间取决于动物首次转移到6L:18D时的年龄。在出生至5周龄之间转移到6L:18D的所有组中，睾丸退化在大约10周龄时开始。相比之下，分别在6、7、9和12周龄转移到6L:18D的仓鼠中，退化分别在11.2、13.3、15.6和18.2周龄时开始。这些结果表明，雄性仓鼠的生殖系统在5至6周龄之前对短日照对生殖功能的抑制作用具有抗性。此后，暴露于短日照会在5至7周内引发仓鼠的睾丸退化。
