The Eazi-Breed CIDR is used to improve the timing and efficiency of cow and heifer breeding programs. Each Eazi-Breed CIDR Cattle Insert contains grams of progesterone. Inserts are administered intravaginally, one per animal, releasing progesterone during the seven-day treatment period. For synchronization of estrus in beef cows, replacement beef and dairy heifers, an injection of Lutalyse must be given one day before insert removal; for lactating dairy cow synchronization administer Lutalyse when insert is removed. Removal of the insert on treatment day seven results in a drop in plasma progesterone, triggering estrus within three days. (Lutalyse is a prescription drug.) Applicator sold separately.
Currently, six different steroidal hormones are approved by the FDA for use in “food animals.” These are the natural hormones estradiol, progesterone, testosterone, and the synthetic hormones trenbolone acetate, progestin melengestrol acetate, and zeranol, all of which make animals grow faster and/or produce leaner meat for food. Dairy cattle are often treated with recombinant bovine growth hormone (rBGH) to increase milk production. Hormones are banned for use in poultry in the . (but that doesn’t stop chicken producers from marketing their birds as hormone-free!).