Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 21, 905-908, Copyright © 1979 by Society for the Study of Reproduction

Sex Steroids in Guinea Pig Fetuses after Sexual Differentiation of the Gonads

ALLEN E. BUHL 1, LINDA M. PASZTOR 1, , and JOHN A. RESKO 1

1 Oregon Regional Primate Research Center, Beaverton, Oregon 97005


Concentrations of testosterone (T), dihydrotestosterone (DHT), estradiol-17beta (E) and progesterone (P) were measured in plasma samples from individual guinea pig fetuses between Days 29-55 of gestation. Umbilical artery blood was collected in capillary tubes and steroid concentrations were measured by radioimmunoassay after chromatography. The T levels in the plasma of males were significantly higher on Day 35 than on Days 45 and 55 of gestation. Both T and DHT concentrations were significantly greater in males than in females on both Day 35 and Day 45. The E concentrations were below the sensitivity of the assay at all stages of development and no sex differences in P were found at any gestational age.

Note:
ACKNOWLEDGMENTS We thank Mr. Bill Baughman, Ms. LouAnne Hefty, Ms. Linda Horton, Mr. Henry Stadelman and Dr. James L. Palotay for their assistance. This research was supported by grants RR-00538, BRSG-5507 RR05694 and HD07658 from NIH. Publication No. 1038 from the Oregon Regional Primate Research Center.

Submitted on February 2, 1979
Accepted on August 4, 1979




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