EAZI-BREED™ CIDR® Cattle Insert Getting cows cycling again just got a little easier. Eazi-Breed™ CIDR® Cattle Insert is now approved for the induction of estrous cycles in anestrous lactating dairy cattle. Eazi-Breed CIDR helps to improve the effectiveness of reproduction programs by tightening estrous synchronization so groups of cows and heifers begin cycling and come into heat and can be bred in a narrower window. Groups of cows also can be synchronized to return to estrus after insemination for potential rebreeding in a desired time frame. LUTALYSE® Injection (dinoprost tromethamine injection) is the only prostaglandin on the market approved for concurrent use with Eazi-Breed CIDR in synchronization protocols of lactating dairy cows.