Improves feed efficiency and rate of weight gain in cattle. Ideal for growing heifers on high quality pastures or forages. Studies have shown that heifers receiving Rumensin increased average daily gain by an average of 0.15 lbs. per day. Contains an enhanced trace mineral package for improved performance. Economical growth promotion increased ADG in replacement heifers can result in earlier breeding, quicker entrance into the milking herd, and increased lifetime productivity. No withdrawal period.