Schmidt A M, Nadal L A, Schmidt M J, Beamer N B
J Reprod Fertil. 1979 Nov;57(2):267-72. doi: 10.1530/jrf.0.0570267.
During a 6-month study period weekly serum samples demonstrated 9 oestradiol surges above 14 pg/ml (range 19-108 pg/ml) among 3 lionesses isolated from male lions. Intervals between peaks ranged from 3 to 8 weeks. Progesterone surges of more than 17 ng/ml (range 17-282 ng/ml) and lasting for 2-6 weeks were recorded after 7 of the oestradiol peaks. Sexual behaviour correlated well with the oestradiol peaks. Except for cornification following oestradiol peaks, there was no obvious vaginal cytology pattern at other times of the cycle. Pregnancy occurred after a 12-h contact with a male during behavioural oestrus. During gestation (108 days) oestradiol values remained low, while progesterone was elevated to 49 ng/ml within 12 h after mating, reaching a peak of 143 ng/ml at the 4th week, and remaining elevated during the next 2 months.
在为期6个月的研究期间，每周采集的血清样本显示，3只与雄狮隔离的母狮中有9次雌二醇激增超过14皮克/毫升（范围为19 - 108皮克/毫升）。峰值之间的间隔为3至8周。在7次雌二醇峰值出现后，记录到孕酮激增超过17纳克/毫升（范围为17 - 282纳克/毫升），且持续2至6周。性行为与雌二醇峰值密切相关。除了雌二醇峰值后的角质化外，在周期的其他时间没有明显的阴道细胞学模式。在行为发情期与雄性接触12小时后怀孕。在妊娠期（108天），雌二醇值保持较低水平，而孕酮在交配后12小时内升至49纳克/毫升，在第4周达到143纳克/毫升的峰值，并在接下来的2个月内保持升高。
