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Tlie efficacy of levonorgestrel butanate in doses 1, 2, 4, and 8 mg/kg in spermatogenesis suppression was studied in adult male Papio hamadrias. The drug was injected intramuscularly twice with 3 month interval. All gestagen doses had an inhibitory effect of spermatogenesis, this effect increasing with the dosage build-up. None of the animals developed azoospermia, which was due to incomplete suppression of the pituitary gonadotropic function and of testosterone secretion. Hormonaldoi:10.14341/probl11922 fatcat:o3iskvzthndr5cdeqtrqfsnfwm