Effects of trans-anethole on the serum levels of ALT and AST in lipopolysaccharide-challenged broilers. The values are represented as mean (n = 8) with their standard errors. Bars with unlike letters means significantly different. Abbreviations: ALT, alanine aminotransferase; AST, aspartate aminotransferase. CON, control group fed with basal diet and treated with saline; LPS, group fed with basal diet and treated with lipopolysaccharide; LPS+TA400, group fed with 400 mg/kg trans-anethole and treated with lipopolysaccharide; LPS+TA600, group fed with 600 mg/kg trans-anethole and treated with lipopolysaccharide.