Intervet - Revalor-S for feedlot steers contains trenbolene acetate (120 mg) and estradiol (24 mg) in 6 small pellets per implant. Slow release delivery system increases rate of weight gain and improves feed efficiency; decreased marbling scores can also result. Administer each implant under the skin back of ear. Storage requires refrigeration. 10 dose cartridge. Not for use in breeding or dairy animals. No withdrawal.