Plasma Progesterone Levels throughout the Ovarian Cycle of the Common Marmoset (Callithrix jacchus)

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Abstract
Radioimmunoassay of progesterone in marmoset plasma has been used to determine ovarian cycle length. Total cycle length was 30.1 .+-. 3.8 days (mean .+-. SD, n = 30, range 24-41 days, median 29.5 days). The pre-ovulatory (follicular) phase, during which progesterone levels were below 10 ng/ml, lasted for 8.8 .+-. 3.7 days (mean .+-. SD, n = 30, range 3-20 days, median 8.5 days). The post-ovulatory (luteal) phase, during which progesterone levels were > 10 ng/ml, lasted for 21.5 .+-. 2.2 days (mean .+-. SD, n = 30, range 14-29 days, median 21.5 days). Total cycle length was almost twice that recorded in an earlier study. The reasons for this difference are discussed.