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Influences of inclusion of oregano essential oil in a low-protein diet on intestinal microbiota of growing-finishing pigs. a,b Letters within a row indicate dramatical differences among means (p < 0.05). 1 Values represent the mean of 6 pigs during the trial. 2 NPD = normal protein group; RPD = reduced protein, amino acid-supplemented group; RPA = 150 mg/kg chlortetracycline group; RPO = oregano essential oil (250 mg/kg) group; E. coli = Escherichia coli.
