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Effects of dietary crude protein (CP) levels on the immunity-related gene expression in the small intestinal mucosa of Huanjiang mini-pigs during 5−10 kg (A, jejunum; B, ileum), 10−20 kg (C, jejunum; D, ileum), and 20−30 kg (E, jejunum; F, ileum) growth stages. Data are presented as means ± SE (n = 6−8 per group). Different superscript letters indicate significant differences among the five groups (P < 0.05). IL, interleukin; IFN, interferon; TNF-α, tumor necrosis factor-alpha. .
