Paul Beck, Oklahoma State University, Extension Beef Cattle Nutrition Specialist — The U. S. Beef industry has used anabolic implants since the mid 50’s when Synovex-S was approved for use in growing cattle. The artificial equivalent to testosterone, trenbolone acetate (TBA), combined with estrogen like compounds has been in use since the late 80’s. The U. S. Food and Drug Administration (FDA) approved implants in use today as efficacious and safe for beef cattle production. There has never been a substantiated adverse event for humans since approval in 1956. All implants are approved for no withdrawal before slaughter, emphasizing their…
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