Jilge B
Lab Anim. 1982 Jan;16(1):1-6. doi: 10.1258/002367782780908832.
The circadian caecotrophy rhythm was synchronized with the light-dark cycle of 12 : 12 h. During this the rabbits practised caecotrophy regularly during the light period. While most rabbits manifested 1 caecotrophy per 24 h (monophasic caecotrophy), some had an additional caecotrophy during the dark period (diphasic caecotrophy). During continuous light the circadian caecotrophy rhythm ran free monophasically, even in those rabbits which were diphasic under the preceding 12 : 12 regime. The average period length amounted to 24.7 +/- 0.3 h. Following restoration of the 12 : 12 routine animals reestablished their original caecotrophy pattern. In a further test the caecotrophy pattern remained constant during a constant 12 : 12 regime, but changed in 7 of 16 animals when the photoperiod was reduced first to 60 min and then to 2 x 60 min light every 24 h. The reduction of the lit time resulted in an increased occurrence of diphasic animals. Details of synchronization of the caecotrophy rhythm with the different light-dark schedules are given. These results accord with data obtained in nocturnal rodent species.
昼夜食粪节律与12:12小时的明暗周期同步。在此期间，兔子在光照期有规律地进行食粪行为。大多数兔子每24小时表现出1次食粪行为（单相食粪），而有些兔子在暗期会有额外的食粪行为（双相食粪）。在持续光照下，昼夜食粪节律以单相自由运行，即使是那些在之前12:12模式下为双相的兔子也是如此。平均周期长度为24.7±0.3小时。恢复12:12的日常模式后，动物重新建立了它们原来的食粪模式。在进一步的试验中，在持续的12:12模式下食粪模式保持不变，但当光周期先减少到60分钟，然后每24小时减少到2×60分钟光照时，16只动物中有7只的食粪模式发生了变化。光照时间的减少导致双相动物的出现增加。给出了食粪节律与不同明暗时间表同步的详细情况。这些结果与在夜行性啮齿动物物种中获得的数据一致。
