In the present study, the ability of aflatoxin B(1) (AFB(1) ) to induce endogenous oxidative damages and the possible ameliorating effects of dietary melatonin (MEL) were investigated. Newly hatched broiler chicks (n = 240) were fed aflatoxin-contaminated diets (0.5 or 1 mg kg(-1) diet) with or without MEL (40 mg kg(-1) bw) supplementation in diet for 40 days. AFB(1) resulted in a significant increase in lipid peroxidation (LPO) in the liver and erythrocytes accompanied with suppression of superoxide dismutase (SOD) and catalase (CAT) enzyme activities of erythrocytes. It also caused a significant reduction in levels of serum proteins and marked elevation in activities of serum transaminases. AFB(1) treatment also decreased both humoral and cell-mediated immune responses in growing chicks. Simultaneous administration of MEL with AFB(1) resulted in an obvious improvement in all the tested parameters. Long-term rather than short-term administration of MEL was more effective in rendering protection against AFB(1)-induced toxicity.
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