Ft. Dodge - Used to help improve average daily weight gain and feed conversion efficiency. Implants contain two pure steroid hormones. Synovex H is recommended for use in heifers (H) weighing 400 lbs. or more for increased weight gain and improved feed efficiency. Each dose consists of 8 pellets containing 200 mg testosterone propionate and 20 mg estradiol benzaate. Do not refrigerate. Not for dairy or replacement heifers. No withdrawal. Synovex S is for use in steers weighing 400 lbs. or more for increased weight gain and improved feef efficiency. Each dose consists of 8 pellets containing 200 mg progesterone propionate and 20 mg estradiol benzaate. Do not refrigerate. For steers only. No withdrawal. Synovex C is recommended for use in suckling beef calves, up to 400 lbs. for increased weight gain and improved feed efficiency. Each dose consists of 4 pellets containing 100 mg progesterone propionate and 10 mg estradiol benzaate. Do not refrigerate. Do not use on bull calves. Intended for reproduction or in calves less than 45 days old. No withdrawal.