Abstract

Castration significantly lowers serum testosterone in sexually active male Triturus cristatus. Replacement therapy by implants of testosterone in silastic capsules elevates the serum testosterone level to higher values than normal. Sex behavior is depressed by castration and partially reinstated by replacement therapy with testosterone. 5α-dihydrotestosterone was the only testosterone metabolite showing some behavioral effectiveness in castrates; estradiol and 5β-dihydrotestosterone failed to elicit sex behavior.

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