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Effect of the dietary supplementation with citrus extract on the concentrations of amino acid fermentation products in the cecal digesta of Chinese yellow-feathered broilers: (A) ammonia, (B) phenolic and indole compounds, and (C) biogenic amines. The values are means ± SEM. Asterisks indicate statistical differences between different groups (one-way ANOVA with a Tukey post hoc test): ∗P < 0.05. CE, citrus extract.
