To verify the ovarian activity in respect to follicular dynamics and corpus luteum activity, 25 cows distributed in five experimental groups according to the crossbreeding level as: group 1: 1/2 Holstein x Zebu, group 2: 3/4 Holstein x Zebu, group 3: 15/16 Holstein x Zebu, group 4: crossbreed pure Holstein and group 5: 7/8 Holstein x Zebu, were daily monitored by ultrasonography examination during two estrous cycle after the second postpartum cycle. The average in days for the interovulatory period […]