Abstract
The purpose of this study was to determine the temporal relationship of peak levels of oestradiol (E2), LH and progesterone to ovulation and sex skin deturgescence in the baboon. A total of 55 baboons were used in these studies. Hormonal levels were measured in 47 cycles and ovulation was documented by laparoscopic examination in 26 of these cycles. A temporal relationship of ovulation to sex skin deturgescence was established in 57 cycles. The mean interval from E2 peak to ovulation was 41.4±2.3 hr, the interval from E2 peak to LH peak was 17.3±2.0 hr and that from LH peak to ovulation was 18.4±2.0 hr. Eleven baboons showed an LH peak on the day of the E2 peak. The number of days to the first sign of sex skin deturgescence after ovulation was 2.07±0.14 days (range 0–5 days). Nineteen cycles (33.3%) showed sex skin deturgescence 1 day after ovulation, another 19 cycles (33.3%) showed sex skin deturgescence 2 days after ovulation, and only 13 cycles (22.8%) showed sex skin deturgescence 3 days after ovulation. Sex skin deturgescence was observed on day 0, 4 or 5 postovulation in only two baboons.
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