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Related Experiment Videos

Plasma testosterone concentration in control and testosterone-treated chick embryos.

J M Gasc, M Thibier

    Experientia
    |October 15, 1979
    PubMed
    Summary

    Testosterone propionate treatment dramatically increases plasma testosterone in chick embryos, reaching levels 500 times higher than controls. These hormonal changes suggest pharmacological effects rather than normal physiological processes.

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    Theriogenology·2003

    Area of Science:

    • Reproductive biology
    • Endocrinology
    • Developmental biology

    Background:

    • Testosterone is a key hormone regulating development and reproduction.
    • Understanding hormonal impacts on embryonic development is crucial.

    Purpose of the Study:

    • To investigate the effects of exogenous testosterone propionate on plasma testosterone levels in chick embryos.
    • To characterize the duration and magnitude of hormonal changes induced by testosterone propionate treatment.

    Main Methods:

    • Administration of testosterone propionate (1 or 2 mg per embryo) to developing chick embryos.
    • Measurement of plasma testosterone concentrations at various time points post-treatment.
    • Comparison of testosterone levels between treated and control embryos.

    Main Results:

    • Plasma testosterone levels in treated chick embryos increased up to 500-fold compared to control embryos.
    • A progressive decline in plasma testosterone was observed in the days following treatment.
    • The induced hormonal changes were significantly beyond physiological ranges.

    Conclusions:

    • Testosterone propionate administration leads to supra-physiological levels of plasma testosterone in chick embryos.
    • The observed hormonal alterations indicate a pharmacological response rather than a physiological one.
    • These findings highlight the potent effects of exogenous androgens during embryonic development.

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