RALGRO-Anabolic Agent Implant RALGRO any time you handle your beef cattle and you'll see a weight gain.RALGRO is essential to good cattle management. It is not a hormone , but the only growth promting implant you can use in cattle. RALGRO is cleared by the FDA for use in feedlot steers and yearlings. One cartridge with 24 doses. RALGRO is essential to good cattle management. It is not a hormone, but the only growth promoting implant you can use in cattle.