Fig. 4. Composition of bacterial communities at the genus level. (a) Quantification of the predominant bacterial genera present in in vitro rumen fermentation. (b) Changes in the relative abundance of the predominant bacteria present in in vitro rumen fermentation at the genus level (% is used to describe the genus abundance). An extended error bar plot was generated by STAMP. Welch's-two-sided test was used and Welch's inverted was 0.95. CON, untreated wheat straw; TRT, steam explosion treated wheat straw.