The present disclosure describes a certain isoflavone-enhanced domestic animal feed compositions and methods of producing such feed compositions. In one particular implementation, a feed composition includes a soy meal that is no more than about 20 weight percent of the feed composition. This soy meal has a soy isoflavone content that provides the feed composition with a soy isoflavone concentration, normalized to an aglycone content of about 250-1400 parts per million on a weight basis (ppm), e.g., about 800-1200 ppm. Feed compositions in certain adaptations have demonstrated some advantages over feeds with lower isoflavone content.