Synovex Primer

**Synovex Primer** is a Zoetis veterinary growth-promoting ear implant for growing beef steers and heifers. Each two-pellet implant contains **50 mg trenbolone acetate** and **7 mg estradiol benzoate**. Trenbolone acetate provides androgenic anabolic activity, while estradiol benzoate provides estrogenic anabolic activity; together, these steroid hormones alter nutrient partitioning to support lean tissue accretion and increase rate of weight gain. It is administered as a single subcutaneous implant in the middle third of the ear and is approved in the United States for growing beef steers and heifers in a dry lot or on pasture.

Brand names

Synovex Primer

Other names

estradiol benzoate + trenbolone acetatetrenbolone acetate + estradiol benzoate