Fig 6. 16S rRNA gene copy numbers determined in the solid rumen phase (0 h; white) and feed residues for Prevotella bryantii and Clostridium aminophilum at different times of incubation (Mean, SEM; green: grass silage; orange: corn silage; n ≥ 4; **P ≤ 0.01; ***P ≤ 0.001).