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The intestinal microbiota in chickens grazing mixed-grass pastures at the phylum and genus levels. Chickens were randomly divided into 3 free-range systems with 3 replicates per treatment: forage-removed paddocks with a high stocking density of 5 m2/hen (control, CK); mixed-grass pastures with a low stocking density of 6 m2/hen (T1), or mixed-grass pastures with a high stocking density of 5 m2/hen (T2). Abbreviations: D, duodenum; I, ileum; C, cecum.
