Eazi-Breed CIDR Sheep Inserts 20ct pkg Active Ingredient: Progesterone, 0.3 gram per EAZI-BREED CIDR Sheep Insert The Eazi-Breed CIDR?Sheep Insert is a convenient and effective method for inducing estrus in production animals. CIDR?Sheep Inserts contain the natural hormone progesterone. Intra-vaginally placed CIDR's release progesterone at a controlled rate into the blood stream. Approved Use Induction of estrus in ewes (sheep) during seasonal anestrus. Key Features Provide an opportunity to induce a fertile estrus. In ewes that respond to treatment the onset of estrus generally occurs within 1 to 3 days after removal of the EAZI-BREEd CIDR Sheep Insert. Dosage and Administration For induction of estrus in ewes (sheep) during seasonal anestrous: Administer one EAZI-BREED CIDR Sheep Insert per ewe for 5 days. After insert removal, use standard flock breeding procedures to breed ewes at induced estrus.