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Biology of Reproduction, Vol 23, 629-635, Copyright © 1980 by Society for the Study of Reproduction

Temporal Relationship Between Follicular Development, Ovulation, and Ovarian Hormonal Profile in the Capuchin Monkey (Cebus apella)

CARLOS A. NAGLE 1, ADELINA RIARTE 1, SILVIA QUIROGA 1, RICARDO MORENO AZORERO 1, MIRTA CARRIL 1, J. HORACIO DENARI 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


Dr. Carlos A. Nagle, Instituto Latinoamericano de Fisiologia de la Reproducción (ILAFIR) Galvan 4102 (1431), Buenos Aires, Argentina.

Concentrations of estradiol and progesterone in peripheral plasma were determined around the periovulatory period in the capuchin monkey (Cebus apella), and the results related to follicular development and ovulation as established by direct observation of the ovaries during serial laparoscopic examinations. In monkeys in which the cycle studied was defined as ovulatory based on both hormonal and laparoscopic findings, a well defined estradiol peak with values ranging from 473.6 to 615.0 pg ml was observed preceded by 10 to 24 h the occurrence of ovulation. The estradiol peak was followed within 12 h by a rise in plasma progesterone, reaching values of 12-15 ng/ml 24 h after the peak. Progesterone levels before the estradiol surge ranged between 2.1 and 7.3 ng/ml.

The site of the developing follicle in the ovary of these monkeys could be identified 4 days before ovulation, and the gradual growth of the follicle to a maximum preovulatory diameter of 10-12 mm could be traced laparoscopically. Ovulation was preceded by vascular changes in the follicular surface as well as by the establishment of the follicular cone. The time of ovulation was characterized by an intimate adherence of the internal surface of the fimbria to the follicular surface. Postovulatory changes in the ovary of Cebus monkeys were less consistent than those occurring before ovulation. In our study two divergent forms of luteal regression were observed, and the risk of misinterpretation of such structures is discussed.

Note:
ACKNOWLEDGMENTS The authors are indebted to Miss A. Huarte, Mr. C. Malateste and Mr. W. Sesma for expert technical assistance. 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 September 20, 1979
Accepted on June 10, 1980






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Copyright © 1980 by the Society for the Study of Reproduction.