HAMP and infection: The addition of Fe-Gly group enhanced the expression of the jejunal DMT1 and HAMP genes in the absence of infection compared with the control (FeSO4 group) (Figures 6A,F); the expression of jejunal FPN gene was significantly lower in the 100 mg of FeSO4 group after infected (p < 0.05, Figure 6C); the expression of jejunal FPN gene was significantly lower in the 100 mg of FeSO4 group compared with the control (FeSO4 group) in the presence of infected.