Synovex H - 10 Implants Heifer Implants For Increased Rate of Weight Gain and Improve Feed Efficiency Each dosage consists of 8 pellets containing 200 mg testosterone propionate and 20 mg estradiol benzoate per implantation. This product was manufactured by a non-sterilizing process. Synovex H Heifer Implants contain two pure steroid hormones, testosterone propionate and estradiol benzoate. This formulation provides a complementary amount of each hormone for maximal growth stimulation. For Animal Use Only For Heifers Only For subcutaneous ear implantation only. Synovex H is recommended for use in heifers weighing 400 lbs or more. When properly administered, Synovex H implants increase rate of weight gain and improve feed efficiency