Figure 1From: Ovarian follicular activity and hormonal profile during estrous cycle in cows: the development of 2 versus 3 wavesUltrasonograms of ovarian follicles, showing a dominant anovulatory follicle (6 mm) in its static phase (on the left) and an ovulatory follicle (12 mm) a day before ovulation (on the right).Back to article page