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The scheme of experimental design. After a 7-day period of adaptation, eighteen piglets were assigned randomly into one of the three groups: control group, AA group, and NAC group. On day 15 of the trial, piglets in the AA and NAC groups received intrarectal administration of 10 mL of 10% AA, whereas piglets in the control group received the same volume of sterile saline. On day 22 of the trial, blood samples and colonic mucosae were collected.
