The Ovary

Urinary Excretion of Oestradiol-17β in the Female Cycle of Goeldi’s Monkeys (Callimico goeldii)

“…593-673] a mid-cycle trough in the level of E2 is well known and coincides approxi mately with the occurrence of ovulation. Ac cording to Schindler [30], the peak level of oestradiol is maintained for a few hours after the initiation of the LH surge, but there is then a rapid decrease resulting in the ob served trough. Ovulation occurs about 34-37 h after the onset of the LH surge.…”

“…This can probably be attributed to stress: the female's mate died 10 days after the beginning of sampling. Stress may affect ovulatory cycles, leading to disrupted patterns or even to suppressed ovulation, as it is well known for women [30,31]. In non-human primates, stressful condi tions such as a change of cage, of location or of companions, may affect ovulatory cycles or suppress ovulation [4,6,10,16,[32][33][34].…”