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Serum creatinine mg/dl and urea mg/dl of male rabbits in response to dietary treatments including a basal diet (NC), a basal diet supplemented with a 500 mg/kg oxytetracycline antibiotic (PC), and a basal diet supplemented with 60, 120, or 180 mg/kg of TEO at 130 days of age. a–d Means within a row with different superscripts differ significantly at P < 0.05.
