Fig 1. 18S rRNA, mcrA, and 16S rRNA gene copy numbers in the fermenter liquid for protozoa (●), methanogens (♦), and total bacteria (■) at different times of incubation (Mean, SEM; green: grass silage; orange: corn silage; gray: blank; n ≥2; **P ≤ 0.01; ***P ≤ 0.001).