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Ovarian follicular development in cattle during either the estrous cycle or postpartum anestrus is not presently well understood. Although several investigators have suggested that follicular development is continuous, the notion that follicular growth occurs in waves still persists. A better understanding of bovine folliculogenesis is required to solve beef production problems such as prolonged postpartum infertility and variable responses to superovulation and estrous synchronization treatments. Therefore, research was conducted at U.S. Meat Animal Research Centerand results compared with earlier studies to explain follicular growth and function in cattle during postpartum anestrus.