This work is a contribution to the knowledge of the age of entry in puberty, by the study of folliculogenesis and follicular atresia in Algerian Rumbi ewes which is characterized by very appreciable reproduction parameters. It seem that puberty in this ovine breed appear between 10 and 12 months, with the onset of first heats in pubertal ewes. The present results show that the ovaries present a germinative area, constituted with a great number of primordial and primary follicles. Their number decrease gradually with the advancement of the ewes. This regression is due to follicular atresia at various stages of their 353 Assiut Vet. Med. J. Vol. 52 No. 109 April 2006 development. This atresia is more marked in the pre-antral and antral follicles. Presence of corpora luteum and graafian follicles without any structural anomaly was observed on young ewe's ovaries, of 8 months old, meaning that they can be fertilized if their body weight is satisfied.