Sex-Related Differences in Blood and Gonad Levels of Testosterone in Silver Fox Fetuses

Sex-Related Differences in Blood and Gonad Levels of Testosterone in Silver Fox Fetuses The mass of silver fox fetuses of both sexes, their gonads, and adrenals, and the levels of testosterone in the blood serum and in gonads and adrenals were determined from day 31 of gestation and every five days thereafter until its termination. Marked sex-related differences were revealed: the blood and gonad levels of testosterone in male fetuses were much higher than those in female fetuses. The fetal adrenals contained significantly less testosterone than the gonads. No sex-related differences in the content of testosterone in the fetal adrenals were found. No differences were found in the body and adrenal mass in female and male fetuses at all the developmental stages studied, while the mass of ovaries exceeded that of testes from day 45 of gestation. The data obtained suggest sex dimorphism in the production of testosterone by gonads in silver foxes appears after day 35 and appears to correspond to the period of morphological differentiation of gonads. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Developmental Biology Springer Journals

Sex-Related Differences in Blood and Gonad Levels of Testosterone in Silver Fox Fetuses

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2001 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Animal Anatomy / Morphology / Histology
ISSN
1062-3604
eISSN
1608-3326
D.O.I.
10.1023/A:1016715118102
Publisher site
See Article on Publisher Site

Abstract

The mass of silver fox fetuses of both sexes, their gonads, and adrenals, and the levels of testosterone in the blood serum and in gonads and adrenals were determined from day 31 of gestation and every five days thereafter until its termination. Marked sex-related differences were revealed: the blood and gonad levels of testosterone in male fetuses were much higher than those in female fetuses. The fetal adrenals contained significantly less testosterone than the gonads. No sex-related differences in the content of testosterone in the fetal adrenals were found. No differences were found in the body and adrenal mass in female and male fetuses at all the developmental stages studied, while the mass of ovaries exceeded that of testes from day 45 of gestation. The data obtained suggest sex dimorphism in the production of testosterone by gonads in silver foxes appears after day 35 and appears to correspond to the period of morphological differentiation of gonads.

Journal

Russian Journal of Developmental BiologySpringer Journals

Published: Oct 9, 2004

References

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