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Effect of dietary L-serine supplementation on the relative mRNA expression of ileal mucosal cytokines of laying hens fed the low crude protein diet. Control, the control diet (16.49% CP); LCP, the low crude protein diet (14.05% CP); LCP + Ser, the low crude protein diet supplemented with 0.498% L-serine. Data are represented with the means ± SEM (n = 8). Bars with no common small letters (a, b) indicate statistical differences among 3 treatments (P < 0.05).
