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Biology of Reproduction, Vol 21, 979-983, Copyright © 1979 by Society for the Study of Reproduction

The Plasma Pattern of Ovarian Steroids during the Menstrual Cycle in Capuchin Monkeys (Cebus apella)

CARLOS A. NAGLE 1, JOSE H. DENARI 1, SILVIA QUIROGA 1, ADELINA RIARTE 1, ALICIA MERLO 1, NESTOR I. GERMINO 1, FRANCISCA GÓMEZ-ARGAÑA 1, , and JORGE M. ROSNER 1

1 Instituto Latinoamericano de Fisiología de la Reproducción (ILAFIR), Universidad del Salvador, Buenos Aires, Argentina and Instituto para el Estudio de la Reproducción Humana (IERH), Asunción, Paraguay


Daily plasma concentrations of estradiol and progesterone were determined during an entire menstrual cycle in 10 capuchin monkeys (Cebus apella). The mean length of the studied cycles was 21.0 ± 1.1 days. Estradiol levels were sim70-100 pg/ml during the early follicular phase (Days 1-4). The levels increased to a midcycle peak of 503.3 ± 30.6 pg/ml occurring on Days 7-9 of the cycle. Thereafter, estradiol declined to minimal values (53.6 ± 5.1 pg/ml) on Day 5 postpeak. During the luteal phase there was no significant increase in estradiol levels. The plasma concentration of progesterone was relatively low (3-10 ng/ml) during the follicular phase. The first increase over previous values occurred on Day 1 after the estradiol peak and reached extremely high values (66.9 ± 5.6 ng/ml) on Day 6 postestradiol peak. Plasma progesterone concentrations fell rather abruptly, reaching the relatively low levels seen during the early part of the cycle, 1 day before the onset of menstruation. In 1 monkey with a presumptive anovulatory cycle the length of the cycle as well as the characteristics of the menstrual flow did not differ from those of monkeys with normal ovulatory cycles. In this animal an estradiol peak was not discernible, whereas progesterone levels showed an oscillating pattern at relatively low levels during the intermenstrual interval.

Note:
ACKNOWLEDGMENTS The technical assistance of W. Sesma, A. Gette and C. Malateste during the course of these studies is gratefully acknowledged. Appreciation is extended to PLAMIRH for their support of this research through grant 101.191.1.78 and to the World Health Organization (SPHR).

Submitted on January 3, 1979
Accepted on July 5, 1979






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Copyright © 1979 by the Society for the Study of Reproduction.