[Ultrastructure of the granulosa cells of the ovarian follicle of ducks (Barbary duck: Cairina moschata, Pekin duck: Anas platyrhynchos].

In the granulosa cells of the ovarian follicle of the ducks, the Golgi apparatus is developed, the granular endoplasmic reticulum is important. Owing to these characters, these cells are probably oriented towards the elaboration of proteins. The seasonal variations of the aspect of these cells are important: in January all organits are not very developed when in May they are all very developed. For a determined season all cells present the same aspect.