Description RALGRO (zeranol) implants for beef cattle is an anabolic agent that increases rate of weight gain of suckling beef calves. It also increases the rate of weight gain and improves feed conversion of weaned beef calves, growing beef cattle, feedlot steers and feedlot heifers.Active ingredient zeranol stimulates animalâs own natural growth systemUsing Ralgro is like getting an extra calf for every wheel (24 doses) usedEach implant contains three pellets of 12 mg zeranol totaling 36 mg per implant24 Ralgro implants provided in a cartridgeWARNING: DO NOT ATTEMPT TO SALVAGE IMPLANT SITE FOR HUMAN OR ANIMAL FOOD. IMPLANT PELLETS IN THE EAR ONLY. ANY OTHER LOCATION IS IN VIOLATION OF FEDERAL LAW. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal.