Follicular development of three (n = 16; A) and four-wave (n = 2; B) cycles in Lohi sheep. Diameters (mean ± SEM) of the largest (F1) and subordinate (SF) follicles were monitored daily for two consecutive ovulations via transrectal ultrasonography. The frequency of 3-wave cycles was relatively greater (p<0.05) than the 4-wave cycles i.e., 87% vs. 13%, respectively.