FIGURE 6.

Relative abundance of archaeal taxa at genus level within rumen fluid (A) and fibrous content (B) samples from dairy cows each fed different ratios of grass silage (GS) to maize silage (MS), e.g., GS67MS33 is a diet containing 67% grass silage and 33% maize silage. All samples were subjected to each of the four different DNA extraction methods (RBB, PBB, FDSS, and PQIAmini). Missing bars indicate that it was not possible to generate an archaeal PCR product for sequencing. Error bars for the GS100 samples represent the standard deviation associated with two different extracts, except for the PQIAmini extracted GS100 rumen fluid sample (A) where n = 1.