A dendritic plot and heatmap of the phyla present within each sample’s sequencing data demonstrate how individual fecal samples cluster together.

From the sequence data, the most obvious finding in the heatmap is that Day 1 samples all have bacteria of the Phylum Proteobacteria in common, while samples outside of Day 1 all share bacteria from the Phylum Firmicutes. At the bottom of the heatmap is a color code of the samples in which the colors designated for each day are the same as Fig 2. In this heatmap, Day 1 foal samples cluster together; samples from other days cluster with each other.