Two experiments were conducted to evaluate the effects of fusaric acid (FA) in broiler chicks (Exp. 1) and turkey poults (Exp. 2). In each experiment, 100 day-old birds were allotted randomly to dietary treatments containing 0, 100, 200, 300, or 400 mg FA/kg of feed. Each dietary treatment was fed to 4 pen replicates of 5 birds each for 21 days. Fusaric acid had no effect (P > 0.05) on feed intake, body weight gain, or feed conversion, which averaged 864 g, 627 g, and 1.38 g/g, and 656 g, 496 g

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... and 1.33 g/g for chicks and poults, respectively. There were no treatment effects on organ weights of poults, however, chicks fed FA had lower (P < 0.05) kidney weights compared to controls. There were no treatment effects on hematology of chicks, however, poults fed the highest level of FA had (P < 0.05) higher hemoglobin and mean cell hemoglobin levels compared to chicks fed 100 mg FA/kg diet. Brain frontal cortex concentrations of norepinephrine, epinephrine, dopamine, and serotonin in poults were not affected by treatment (P > 0.05), but chicks fed 100, 200 and 300 mg FA/kg diet had higher brain concentrations of norepinephrine (P < 0.05) compared to controls. Chicks fed 300 and 400 mg FA/kg also had higher concentrations of epinephrine (P < 0.05) compared to controls. Results indicate that FA is not toxic to broiler chicks or turkey poults at these dietary concentrations.