Effects of trans-anethole on the protein expression of NF-κB pathway in the liver of LPS-challenged broilers. The values are represented as mean (n = 4) with their standard errors. Bars with unlike letters means significantly different. Abbreviations: NF-κB p65, nuclear factor kappa B p65; IκBα, inhibitor of NF-κB alpha. 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.