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Alpha diversity indices Shannon, Chao1 and Observed_species derived from Tibetan sheep, Small Tail Han sheep and Yak. The Wilcoxon test was used to determine the significant level between two animal groups, while Kruskal−Wallis test was used to calculate the significant level among animal groups, and the p value was adjusted using Benjamini−Hochberg method. a, b = different letters indicate a significant difference between animal species (p < 0.05).
