Fig. 3

The relative abundances of archaea in rumen. a Relative abundances of archaeal communities at the phylum level. b Relative abundances of archaeal communities at the genus level. c Relative abundances of archaeal communities at the species level. The difference among three groups was identified by Kruskal–Wallis multiple comparisons, and asterisk indicated the significant difference (P value < 0.05). CON control diet, BS control diet plus Bacillus subtilis, MCE control diet plus Macleaya cordata extract