Calf implants designed to increase feed efficiency and/or rate of weight gain in beef cattle. Few production tools are more important for beef producers in today's economic climate than growth implants. Independent research has demonstrated that few management practices show a higher return on investment than programmed use of growth-enhancing implants. Contains 100 mg progesterone and 10 mg estradiol. For use with suckling beef calves 45 days or older. Not approved for use in veal