CD40LG and Salmonella Infections: To explore whether berberine modulates the body’s response to Salmonella infection, the levels of immunoglobulins (IgA, IgM, and IgG), antioxidant indicators (alkaline phosphatase activity and total antioxidant capacity), high-density lipoprotein (HDL), low-density lipoprotein (LDL), triglycerides, and total cholesterol were measured in the serum of chicks from each group at 21 and 35 days of age.