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In Muscovy and Peking domestic female ducks, the cells showing a ð.5-3-!-hydroxysteroid dehydrogenase activity were localized at the theca interna level of the follicles, whereas the cells with an active r7-fi-hydroxysteroid dehydrogenase enzyme were spread under the germinative epithelium. The relationship established between these two cellular categories was quite different and characteristic for each species of female ducks.

HISTOLOGICAL AND CYTOLOGICAL STUDY OF THE TESTIS AND GENITAL TRACTS OF MUSCOVY DUCKS (CAIRINA MOSCHATA L.) DURING SEXUAL ACTIVITY