MANISH KUMAR GARGDr. J.S. MEHTA2019-01-252019-01-25http://krishikosh.egranth.ac.in/handle/1/5810092474Ultrasonographic studies on ovarian follicular dynamic revealed that indigenous and crossbred cows were having 2 or 3 wave pattern with predominance of 2 wave pattern during spontaneous normal estrous cycle. In two wave pattern the first and second waves persisted for 14.6±0.9 to 15.3±1.0 and 9.75±0.8 to 10.7±1.5 days while in the three wave pattern first, second and third waves persisted for 14.3±0.6 to 15.4±0.6, 10.45±1.1 to 12.7±0.4 and 6.5±1.8 to 7.6±0.3 days, respectively, in both the types of cows. Significantly higher persistency (p<0.05) was recorded in the anovulatory wave/s than the ovulatory follicular wave in both the types of cows irrespective of 2 or 3 wave pattern.ennullThesis