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Effects of steroids on bovine follicle formation in vitro. Numbers of follicles (primordial + primary) in ovarian cortical pieces from around d 100 of gestation after 0 (black bar) or 10 (white bar) d in culture with control medium (Con), estradiol (E2), or progesterone (P4; both at 1 μM). Data are means ± SEM; means with different letters (a, b) differ (P < 0.05; n = 4; 2 cultures from each of 2 fetuses). Adapted from Fortune et al. (2010).
