Abstract
1200 Holstein cows will be used to evaluate if the estrous cycle at the beginning of the ovulation synchronization protocol (cyclic cows) and the concentration of progesterone during the ovulation synchronization protocol (in cows without a corpus luteum) interferes on the conception by AI or ET. The protocol that will be used: D0 BE CIDR +2 ml, 5 ml Lutalyse D7, D8 Removal CIDR + ECP0.5 …