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Effects of cadmium chloride on antioxidant parameters in the serum of laying hens. Values are represented as the mean ± SE (n = 8). a-cColumns with different superscript letters are significantly different (P < 0.05). Abbreviations: CAT, catalase; GSH-Px, glutathione peroxide; GSH, glutathione; T-SOD, total superoxide dismutase; MDA, malondialdehyde.
