Isoflavone-supplemented milk replacers fed to young animals during a pre-weaning provides isoflavones in the milk replacer at a level of about 700 mg per kilogram of the milk replacer, and/or provides about 450 mg of the supplemental isoflavone in at least about 1.5 pounds of the milk replacer by dry weight such that the animal ingests this amount of the isoflavone per day, and/or provides in the milk replacer at least about 50 mg of isoflavone per pound of the animal's birth weight is ingested per day. In response to ingesting the isoflavone-supplemented milk replacer, the young animal experiences improved performance.
