Timing of parturition in the rat: an analysis of successive births.

Chronobiologia Pub Date : 1991-01-01
D L Rowland, A L Wagonblast, T A Dykstra
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Abstract

To determine whether consecutive parturitions within individual rats are likely to occur around the same time of the 24h day, female rats mated prior to ovulation and maintained on a LD 12:12 photoperiod, were observed over either two or three parturitions. A subgroup of females was placed on constant light during the second gestation in order to determine the role of photoperiod in the temporal synchronization of consecutive births. The major findings were 1. individual females tended to give birth around the same time of the day on consecutive births so long as the photoperiod remained constant; 2. the small percentage of births occurring during darkness, the less-prevalent time of the photoperiod for birthing, were anomalous births for individual females; and 3. litter weight was a significant factor in predicting time of birth for females, but this effect interacted with photoperiod. These data elucidate the importance of knowing previous birth time, litter weight, and photoperiod on predicting the time of parturition in the rat.

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大鼠的分娩时间:连续分娩的分析。
为了确定单个大鼠是否可能在24小时内的同一时间连续分娩,在排卵前交配的雌性大鼠在ld12:12的光周期下进行了两次或三次分娩观察。为了确定光周期在连续分娩的时间同步中的作用,在第二妊娠期间将一组雌性置于恒定光照下。主要发现是1。只要光周期保持不变,雌性个体倾向于在连续分娩的同一时间分娩;2. 在黑暗中分娩的比例很小,在分娩的光周期不那么普遍,这对个体雌性来说是异常的;和3。窝重是预测母鼠出生时间的重要因素,但这种影响与光周期相互作用。这些数据阐明了了解前出生时间、窝重和光照周期对预测大鼠分娩时间的重要性。
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