Eazi-Breed CIDR cattle insert can improve the timing and efficiency of a beef breeding program. Eazi-Breed CIDR helps to improve the effectiveness of reproduction programs by tightening estrus synchronization so groups of cows and heifers come into heat and can be bred in a narrow window. Groups of cows also can be synchronized to return to estrus after insemination for potential rebreeding in a desired time frame. Lutalyse sterile solution (dinoprost tromethamine) is the only prostaglandin product on the market approved for concurrent use with Eazi-Breed CIDR in synchronization protocols of lactating beef cows.