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Urinary oestrogen excretion in the female cotton-topped tamarin (Saguinus oedipus oedipus)

Summary. Daily urinary oestrogen excretion was measured by radioimmunoassay in 6 adult female cotton-topped tamarins. Four females showed obvious cyclicity in oestrogen excretion and the mean cycle length for 10 complete cycles was 22·7 ± 1·7 days with a range of 19–25 days. In 3 of the 6 females a dip-and-read test for blood in the urine gave positive readings which were distributed during trough and mid-cycle periods although females of this species are believed not to menstruate.