[Autoradiography and tritiated thymidine labeling during spermatogenesis of the Barbary Duck (Cairina moschata L.)].

Using autoradiographic method (intraveinous of 1 mCi-3H thymidine/kg of body weight) the authors show that meiotic prophase of the spermatogenesis of the Barbary drake (Cairina moschata L.) lasts 5 days 1/4; the first labeled gametes appear in the ejaculate at the end of the 12th day.