Figure 2.

Distribution of the most abundant archaeal (A), bacterial (B–D), and fungal (E) taxa with average abundance ≥1% and that were identified in at least 50% of all samples in the rumen of calves grouped according to diet (M: milk-fed or MC: milk and starter concentrate fed) and age group (7, 28, 49, and 63 days). The group “Others” refers to taxa that displayed relative abundances <1.0% whereas “Unclassified” refers to sequences that could not be assigned to phylum, family, genus, or species level.