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Relative mRNA expression levels of spleen inflammation-related cytokines of broilers in different treatments. C, birds fed with basal diet; EP, birds fed with basal diet and challenged with E. coli O78; EF, birds fed a basal diet supplemented with E. faecium and challenged with E. coli O78. Bars with letters (a–c) suggested significant difference among different treatments (P < 0.05)
