Abstract
Investigations of primordial follicle formation and growth are fundamental to our understanding of female gamete production. In all mammalian females the full complement of oocytes is established during fetal development. This store of primordial follicles is not renewable and serves the entire reproductive life span of the adult. The correct programming of fetal ovarian development and the number of primordial follicles formed will therefore limit the fecundity of the ovary. Primordial follicles are characterized by the presence of a single oocyte surrounded by a varying number of preganulosa cells. The relatively small size, undifferentiated status and large numbers of primordial follicles make them prime candidates for use in basic and applied research in animal production, gene transfer and cloning. Furthermore, the development of cell culture systems that use primordial follicles as a source of oocytes for in vitro growth and maturation will enable us to maximize the potential of high genetic merit females and to shorten generation intervals. Despite these possibilities, primordial follicles are the least understood of all stages of follicle development. The factor(s) responsible for maintaining the primordial pool or, conversely, for activating primordial follicle growth remain elusive.
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