Table 2. Spearman correlation analysis between VFA and OTU-S3004, methanogenic archaea, and S and P producers in solid rumen samples.
| Taxonomic assignment | acetate | propionate | n-butyrate | A:P | ||||
|---|---|---|---|---|---|---|---|---|
| ρ | P value | ρ | P value | ρ | P value | ρ | P value | |
| F. succinogenes | -0.26 | NS | -0.46 | <0.001 | -0.31 | <0.05 | +0.40 | <0.01 |
| Treponema | +0.07 | NS | -0.21 | NS | +0.08 | NS | +0.39 | <0.01 |
| Megasphaera | 0.00 | NS | +0.17 | NS | -0.18 | NS | -0.29 | <0.05 |
| Selenomonas | +0.01 | NS | +0.04 | NS | +0.07 | NS | -0.07 | NS |
| Succiniclasticum | +0.09 | NS | +0.01 | NS | 0.28 | <0.05 | +0.10 | NS |
| R. flavefaciens | -0.28 | <0.05 | +0.19 | NS | -0.58 | <0.00001 | -0.43 | <0.001 |
| Prevotella | -0.16 | NS | +0.39 | <0.01 | -0.31 | <0.05 | -0.64 | <0.000001 |
| Succinivibrionaceae excluding S3004 | -0.07 | NS | 0.00 | NS | -0.23 | NS | -0.13 | NS |
| Succinivibrionaceae including S3004 | -0.12 | NS | +0.15 | NS | -0.37 | <0.01 | -0.33 | <0.05 |
| OTU-S3004 | -0.13 | NS | +0.06 | NS | -0.14 | NS | -0.24 | NS |
| OTU-M7 | 0.25 | 0.07 | -0.29 | <0.05 | 0.48 | <0.001 | 0.69 | <1x10-20 |
| OTU-M10 | -0.02 | NS | 0.34 | <0.05 | -0.05 | NS | -0.31 | <0.05 |
| Methanobacteria and Methanomicrobia | 0.13 | NS | -0.07 | NS | +0.39 | <0.01 | +0.35 | <0.01 |
| Thermoplasmata | -0.06 | NS | -0.35 | <0.01 | +0.06 | NS | +0.37 | <0.01 |
Values for relative abundances and VFA concentrations for all treatment groups (R, A, RA and AA) and rumen fractions (liquid and solid) were combined. ρ = Spearman’s rank correlation coefficient. NS = non-significant. A:P = acetate:propionate ratio.