Effects of piceatannol supplementation on expression levels of SIRT1 protein in the liver of diquat-induced piglets. The column and its bar represented the means value and SE (n = 6), respectively. SIRT1, sirtuin 1; CON, piglets were orally administrated vehicle solution (0.5% sodium carboxymethyl cellulose) and challenged with sterile saline; DQ-CON, piglets were orally administrated vehicle solution and challenged with diquat (10 mg/kg body weight); DQ-PIC, piglets were orally administrated piceatannol (80 mg/kg/day) and challenged with diquat (10 mg/kg body weight). a, b, c Different letters on the shoulder mark indicate significant differences (p < 0.05).