Fig. 1

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