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Alpha diversity index. Five indicator box plots: the observed species index shows the number of OTUs actually observed; ACE and Chao indices were used to estimate the number of OTUs and microbial richness; and Shannon and Simpson indices were used to assess biodiversity. Abbreviations: ACE, abundance-based coverage estimator; HFE, high feed efficiency; LFE, low feed efficiency; OTUs, operational taxonomic units.
