Fig 2.

Anti-Salmonella IgG in the serum of pigs weaned at the age of 28 days and fed a diet with 60 to 80 (LZn), 150 (MZn), or 2,500 (HZn) mg Zn/kg as ZnO before and after oral infection with S. Typhimurium at the age of day 32. Mean values plus standard deviations for the percentage of optical density (OD%) are shown. The pound sign (#) indicates the tendency (P = 0.098) for the HZn group to have higher levels of anti-Salmonella IgG than the MZn and LZn groups at 42 dpi. The following numbers of samples were analyzed: for the LZn group, 24 samples on days 0 and 2 and 12 samples between days 7 and 42; for the MZn group, 23 samples on days 0 and 2 and 12 samples between days 7 and 42; for the HZn group, 24 samples on days 0 and 2, 12 samples between days 7 and 21, and 11 samples on days 24 to 42.