title: Plasma progesterone levels throughout the ovarian cycle of the common marmoset (Callithrix jacchus).
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 greater than 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.
mesh_terms: D000818:Animals; D002144:Callithrix / Q000502:physiology*; D002143:Callitrichinae / Q000502:physiology*; D005260:Female; D005498:Follicular Phase; D008183:Luteal Phase; D008598:Menstruation; D010053:Ovary / Q000502:physiology*; D011374:Progesterone / Q000097:blood*; D013997:Time Factors
chemical_list: D011374:Progesterone