Bielert C, Czaja J A, Eisele S, Scheffler G, Robinson J A, Goy R W
J Reprod Fertil. 1976 Jan;46(1):179-87. doi: 10.1530/jrf.0.0460179.
Behavioural and hormonal data were collected throughout pregnancy in captive rhesus monkeys. Heterosexual pairs observed in daily time-limited mating tests showed two distinct periods of increased sexual interaction, as measured by the incidence of ejaculation. One period was coincident with the preovulatory oestradiol peak, while the other occurred between the 6th and 10th weeks of pregnancy. The positive relationship found during the menstrual cycle between the ratio of circulating oestradiol: progesterone and degree of sexual activity continued for the first 8 weeks of pregnancy. However, sexual activity ceased in the second half of pregnancy despite a continued high oestradiol: progesterone ratio.
在圈养恒河猴的整个孕期收集行为和激素数据。在每日限时交配测试中观察到的异性配对显示，通过射精发生率衡量，有两个明显的性互动增加期。一个时期与排卵前雌二醇峰值同时出现，而另一个时期发生在怀孕第6至10周之间。在月经周期中发现的循环雌二醇与孕酮的比例与性活动程度之间的正相关关系在怀孕的前8周持续存在。然而，尽管雌二醇与孕酮的比例持续较高，但在怀孕后半期性活动停止。
