Avian and poultry biology reviews vol:13 issue:3 pages:145-153
The reproductive cycle of the hen, characterised by well-ordered ovulation and oviposition cycles and by a strict hierarchical growth of follicles, is a suitable model for the study of folliculogenesis. Under the impact of recent developments in mammalian reproductive endocrinology, emphasis has been put on the role of growth factors in folliculogenesis and steroidogenesis during the last decade. The state of the art will be reviewed here. Moreover, new findings concerning different pathways of steroidogenesis as well as regulation at the hypothalamic/pituitary level are considered.