Jallageas M, Assenmacher I
Gen Comp Endocrinol. 1986 Aug;63(2):301-8. doi: 10.1016/0016-6480(86)90168-1.
The annual cycle of hibernation, body weight, and plasma testosterone and thyroxine levels were compared in 7 orchidectomized and 16 intact dormice under natural conditions, and in 21 thyroidectomized and 23 intact dormice exposed to a 12-hr light and 12-hr darkness photoperiod under natural temperatures. Hibernation was not affected by either orchidectomy or thyroidectomy, nor did thyroidectomy alter the annual body weight cycle, which, however, was obliterated by orchidectomy. As regards endocrine cycles, orchidectomy had no significant effects on the annual thyroxine cycle, whereas thyroidectomy obliterated the annual testosterone cycle, which was replaced by short-lived, infradian plasma thyroxine cycles. As the latter resembled the fluctuations previously observed in intact animals exposed to constant ambient temperatures, it is proposed that in edible dormice, the annual thyroid cycle, which is thermoperiodically entrained, in turn entrains the testosterone cycle.
在自然条件下，对7只去势睡鼠和16只完整睡鼠的冬眠年周期、体重以及血浆睾酮和甲状腺素水平进行了比较；在自然温度下，对21只甲状腺切除的睡鼠和23只完整睡鼠暴露于12小时光照和12小时黑暗的光周期下的情况进行了比较。冬眠不受去势或甲状腺切除的影响，甲状腺切除也未改变体重年周期，但去势会消除该周期。关于内分泌周期，去势对甲状腺素年周期无显著影响，而甲状腺切除则消除了睾酮年周期，取而代之的是短暂的、次昼夜血浆甲状腺素周期。由于后者类似于先前在暴露于恒定环境温度的完整动物中观察到的波动，因此有人提出，在食用睡鼠中，受热周期调节的甲状腺年周期反过来调节睾酮周期。
