This study evaluated the effects of dietary soy isoflavones, in order to demonstrate that the specific immunomodulatory effects observed with soy isoflavone supplementation in the PI’s most recent study will confer growth performance and immunological benefits well beyond the acute period in PRRSV-infected pigs. The goal was to show a time-dependent biological mechanism by which soy isoflavones exert immunomodulatory effects and their influence on growth performance over the growing period in pigs raised under conditions mimicking industry standard