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The antioxidant effects of natural clinoptilolite (NCLI) and modified clinoptilolite (MCLI) were investigated in broilers that were repeatedly challenged with lipopolysaccharide (LPS).A total of 288 1-d-old commercial Arbor Acres broiler chicks were divided equally into three treatment:control,NCLI-treated (2%) andMCLI-treated (2%) groups based on initial body weight (P > 0.05).