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Biology of Reproduction, Vol 21, 289-292, Copyright © 1979 by Society for the Study of Reproduction

Serum Testosterone of Neonatal Male and Female Dogs

BENJAMIN L. HART 1, and JAN LADEWIG 1

1 Department of Physiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, California 95616


Serum testosterone (T) was determined for male and female dogs from Day 2 (48-72 h after birth) through Day 49. For the first 20 days of life, the T levels of both sexes were relatively stable and very low by adult male standards. The level for males was sim0.15 ng/ml and was significantly higher than that for females which was sim0.10 ng/ml. The levels for both males and females, however, may be so low postnatally that they are not biologically significant. If there was a "masculinizing" perinatal surge in T secretion in males, it undoubtedly occurred prenatally.

Note:
ACKNOWLEDGMENTS We thank Tom Madley of the California Primate Research Center for performing the radioimmunoassays.

Submitted on December 14, 1978
Accepted on April 27, 1979






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