Action of sex steroid hormones on temperature-induced sex determination in the snapping turtle (Chelydra serpentina).

摘要: Administration of exogenous estradiol benzoate (EB) or an estrogen agonist, R2858, into eggs snapping turtles caused all embryos incubated at male-producing temperatures to develop as females, whereas testosterone propionate (TP) 42% the females. Some treated with EB, TP also had hypertrophied oviducts. Neither dihydrotestosterone (DHT) nor cholesterol any apparent effect on sex determination temperatures. Injections TP, DHT, androgen agonist R1881, no female-producing antiserum resulted in some individuals having undifferentiated ambiguous gonads. Although both estrogens and androgens can induce embryonic gonads ovaries, findings this study indicate that is female-inducing hormone may feminize via aromatization estrogen. Furthermore, results antisera injections suggest endogenous steroid hormones have a natural role gonadal differentiation reptiles environmental determination.