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Table 2 Relative abundances of ruminal bacterial phyla affected by Saccharomyces cerevisiae fermentation products (SCFP) and a subacute ruminal acidosis (SARA) challenge as determined by 16S rRNA gene sequencing

From: Saccharomyces cerevisiae fermentation products (SCFP) stabilize the ruminal microbiota of lactating dairy cows during periods of a depressed rumen pH

Phylum No SCFP SCFP SEM1 P-value
Control SARA Control SARA SARA SCFP SARA* SCFP
Above 0.1% community
Bacteroidetes 46.84a 20.78b 40.57 32.49 4.72 < 0.01 0.44 0.02
Firmicutes 35.08 53.86 43.44 50.25 5.06 0.04 0.69 0.3
Proteobacteria 1.12 13.88 0.78 5.5 2.74 0.02 0.39 0.46
Spirochaetes 1.41x 0.11y 1.79x 0.69y 0.22 < 0.01 0.06 0.68
Tenericutes 1.85x 0.45y 1.84x 1.06y 0.24 < 0.01 0.24 0.22
Cyanobacteria 1.05a 0.41b 0.60a 0.44b 0.15 0.02 0.23 0.22
SR1 0.75 0.43 0.53 0.22 0.2 0.14 0.32 0.18
TM7 0.41 0.28 0.31 0.23 0.08 0.22 0.36 0.99
Between 0.01 and 0.1% of community
Verrucomicrobia 0.23a 0.02b 0.36a 0.04b 0.05 < 0.01 0.17 0.74
Actinobacteria 0.052 0.072 0.047 0.032 0.029 0.94 0.51 0.6
Chloroflexi 0.005 0.016 0.049a 0.009b 0.01 0.25 0.13 0.05
Elusimicrobia 0.033a 0.002b 0.042a 0.005b 0.013 0.02 0.8 0.87
Fibrobacteres 0.115 0.047 0.088 0.082 0.028 0.16 0.89 0.24
Lentisphaerae 0.095 0 0.042 0.011 0.021 0.16 0.89 0.24
Planctomycetes 0.021 0.016 0.046 0.008 0.013 0.13 0.54 0.26
Synergistetes 0.016 0 0.025 0.009 0.009 0.16 0.39 0.93
  1. 1SEM standard error of mean
  2. a, bLSmeans with different letters within SCFP treatment (No SCFP or SCFP) differ (P < 0.05)
  3. x, yLSmeans with different letters within SCFP treatment (No SCFP or SCFP) tend to differ (P < 0.10)