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Plasma oxytocin concentrations during the menstrual cycle in the rhesus monkey, Macaca mulatta

Summary. Plasma samples were obtained from 8 conscious rhesus monkeys at 3–4 day intervals throughout the menstrual cycle. Oxytocin concentrations were significantly higher in mid-cycle (Days 10–11) than at Days 4–5 (P < 0·01) and Days 28–29 (P < 0·02, Wilcoxon signed rank test). No significant correlations between oxytocin and oestradiol or progesterone were found.