Influence of daylength on male hamster sexual behavior: masking effects of testosterone.
Influence of daylength on male hamster sexual behavior: masking effects of testosterone.
复制标题
日长对雄性仓鼠性行为的影响：睾酮的掩盖作用。
DOI：
10.1016/0031-9384(91)90258-p
复制
发表时间：
1991
影响因子：
2.9
通讯作者：
Powers,JB
中科院分区：
文献类型：
--
作者：
Pospichal,MW;Karp,JD;Powers,JB
雄性仓鼠暴露于短光周期6-8周会导致与接受性雌性的性行为缺陷。本实验验证了这一假设，即在长期和稳定水平的睾酮存在下，短期光周期对行为的影响可以被掩盖。雄性动物被阉割，并在长（16 L：8 D）或短（8 L：16 D）光周期条件下饲养7周时给予睾酮的硅橡胶胶囊。此时的性行为测试表明，短光周期雄性交配不太好，但组间差异并不明显。然后取出替吉奥胶囊，将16 L：8 D和8 L：16 D中的一半动物转移到相反的光周期。18天后，随着功能性阉割效果的发展，对性行为进行了测试。这些测试表明，在没有睾酮的情况下，光周期效应比在睾酮仍然存在时的第7周测试期间明显得多。从一个光周期转移到另一个光周期的雄性的行为表明，暴露于短光周期仅18天不足以产生短光周期样的性行为缺陷。相比之下，暴露于长光周期18天足以逆转已经产生的短光周期效应。
Exposure of male hamsters to short photoperiods for 6–8 weeks causes deficits in sexual behavior with receptive females. The present experiment tested the hypothesis that short photoperiodic effects on behavior could be masked in the presence of chronic and stable levels of testosterone. Males were castrated and administered Silastic capsules of testosterone while housed in long (16L:8D) or short (8L:16D) photoperiodic conditions for 7 weeks. Sexual behavior tests at this time indicated that the short photoperiod males copulated less well, but group differences were not robust. Testosterone capsules were then removed and half the animals in both 16L:8D and 8L:16D were transferred to the opposite photoperiod. Sexual behavior was tested 18 days later as the effects of this functional castration developed. These tests indicated that photoperiodic effects were much more obvious in the absence of testosterone than they were during week 7 tests when testosterone was still present. The behavior of the males that were transferred from one photoperiod to the other demonstrated that exposure to the short photoperiod for only 18 days was not sufficient to generate short photoperiod-like sexual behavior deficits. In contrast, exposure to the long photoperiod for 18 days was sufficient to reverse short photoperiodic effects that had already developed.