Abstract
Detection of non-pregnant cows by Doppler ultrasonography on Days 20-22 (detection of luteolysis) post-first AI can reduce the interval between inseminations in cattle. However, information regarding use of 17beta-estradiol (E2) and estradiol benzoate (EB) to resynchronize the ovulation in pregnant animals is limited, and the results are inconclusive. The main objective with this study is…