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Biology of Reproduction, Vol 23, 64-71, Copyright © 1980 by Society for the Study of Reproduction

Sexual Performance as a Function of Time of Day in Male and Female Rats

RICHARD E. HARLAN 1, BRENDA D. SHIVERS 1, ROBERT L. MOSS 1, JAMES E. SHRYNE 2, , and ROGER A. GORSKI 2

1 Department of Physiology, University of Texas Health Science Center, Dallas, Texas 75235
2 Department of Anatomy and Brain Research Institute, University of California, Los Angeles, California 90024


The Rockefeller University, New York, NY 10021.

Experiments were conducted to determine the effect of time of day on lordotic responsiveness and masculine sexual performance of rats. In experiment 1, no consistent diurnal rhythm in lordotic responsiveness was observed in ovariectomized rats given sequential treatment with estradiol benzoate and progesterone, or in ovariectomized rats maintained on Silastic capsules containing estradiol. In experiment 2, a strong diurnal variation in masculine sexual performance was observed in intact male rats. In experiment 3, a similar diurnal rhythm in masculine sexual performance was observed in castrated male and female rats bearing Silastic capsules containing testosterone. These data suggest that in Long-Evans-derived rats masculine sexual performance varies as a function of time of day, whereas lordotic responsiveness in female Sprague-Dawley-derived rats does not.

Note:
ACKNOWLEDGMENTS The authors wish to thank Loretta Kelly, Donna King and Gabriele Zummer for secretarial help.

Submitted on September 20, 1979
Accepted on April 14, 1980






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