Abstract
An experiment was conducted to evaluate dietary vitamin or trace mineral supplementation effects during 28–49 days posthatching on body weight, feed consumption, and delayed contact hypersensitivity reactions to dinitrofluorobenzene in broilers reared in thermoneutral (24°C) and cyclic heat distress (24–35°C) environments. Heat distress reduced (P≤.05) body weight, feed consumption, and delayed hypersensitivity reactions. The most pronounced (P≤.05) body weight, feed consumption, and delayed hypersensitivity responses were noted in broilers whose basal diet was not fortified with vitamins but contained trace mineral supplementation. Vitamin supplementation devoid of dietary trace mineral fortification did not affect (P>.1) body weight, feed consumption, or the delayed hypersensitivity reactions. In conclusion, heat distress and dietary vitamin inadequacy suppressed broilers performance and impaired cellular mediated immunity.
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