Fig. 2

Effects of different dietary supplements on the relative mRNA expression of TNF-α of laying hens. a Expression levels of TNF-α mRNA in the liver at different time points; b Expression levels of TNF-α mRNA in the spleen at different time points; c Expression levels of TNF-α mRNA in the ileum at different time points; d Expression levels of TNF-α mRNA in the cecum at different time points