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Biology of Reproduction, Vol 13, 597-602, Copyright © 1975 by Society for the Study of Reproduction

Photoperiod Effect on Gonadotropin Releasing Hormone Induced Ovulation in the Immature Rat

R. W. STEGER 1, J. J. PELUSO 1, J. A. MITCHELL 1, , and E. S. E. HAFEZ 1

1 Reproductive Physiology Laboratories, C. S. Mott Center for Human Growth and Development and Department of Anatomy, Wayne State University School of Medicine, Detroit, Michigan 48201


Immature female rats exposed to constant light from birth, ovulated by 35 days of age in response to 1000 ng of gonadotropin-releasing hormone (GnRH). Animals reared in a 14 h light:10 h dark photoperiod did not ovulate by 37 days of age unless previously primed with PMS. Constant light or PMS administration decreased the age at which large ovulatory follicles first appeared, therefore, possibly explaining the ability of GnRH to induce ovulation at an earlier age in these animals. Constant light, however, inhibited the ovulatory response to PMS alone. GnRH can override this inhibition indicating that constant light alters the ability of the hypothalamus and/or other CNS components to regulate GnRH secretion.

Submitted on July 16, 1975
Accepted on September 16, 1975






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Copyright © 1975 by the Society for the Study of Reproduction.