ZnCP treatments. Compared to con and ANT, 0.2% and 0.4% ZnCP Treatments significantly increased immunoglobulin G (IgG) in jejunal mucosa at 21 day (P=0.005), and 0.1% ZnCP supplementation improved the content of secretory immunoglobulin A (sIgA) in jejunum at 42 day (P