Fig. 1.

A) Photomicrographs of early stages of bovine follicular development. Bar = 20 μm. B) Numbers of primordial and growing follicles (only primary follicles before Day 211; primary plus occasional secondary follicles after Day 210) in freshly isolated bovine cortical pieces (means ± SEM). Black bars show data for primordial follicles, and white bars represent growing follicles. Means with different letters within follicle type (primordial: a, b, c; growing: x, y) across gestational stage are significantly different (P < 0.05). (Adapted from Yang & Fortune 2008, with permission.)