For use in suckling beef calves (at least 45 days of age) up to 400 pounds of body weight. For subcutaneous ear implantation, one dose per animal. Do not use in bull calves intended for reproduction. Safety and effectiveness have not been established in veal calves. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. This product is approved for concurrent use of dinoprost solution on day 7 of the 7-day administration period when used for the following indications: For synchronization of estrus in lactating dairy cows. Do not use in animals with abnormal, immature, or infected genital tracts; or in dairy cows that are fewer than 40 days postpartum for synchronization of estrus or synchronization of the return to estrus; or in anestrous lactating dairy cows less than 42 days or greater than 78 days postpartum for induction of estrous cycles. Do not use an insert more than once. To prevent the potential transmission of venereal and blood borne diseases, the inserts should be disposed after a single use. Administration of vaginal inserts for periods greater than 7 days may result in reduced fertility. Product labeling shall bear the following warnings: "Avoid contact with skin by wearing protective gloves when handling inserts. Store used (removed) inserts in a plastic bag or other sealable container until they can be properly disposed in accordance with applicable local, State, and Federal regulations. Do not use in animals with abnormal, immature, or infected genital tracts; or in dairy cows that are fewer than 40 days postpartum for synchronization of estrus or synchronization of the return to estrus; or in anestrous lactating dairy cows less than 42 days or greater than 78 days postpartum for induction of estrous cycles. Do not use an insert more than once. To prevent the potential transmission of venereal and blood borne diseases, the inserts should be disposed after a single use. Administration of vaginal inserts for periods greater than 7 days may result in reduced fertility Product labeling shall bear the following warnings: "Avoid contact with skin by wearing protective gloves when handling inserts. Store used (removed) inserts in a plastic bag or other sealable container until they can be properly disposed in accordance with applicable local, State, and Federal regulations..