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

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

Phylum	No SCFP		SCFP		SEM¹	P-value
Phylum	Control	SARA	Control	SARA	SEM¹	SARA	SCFP	SARA* SCFP
Above 0.1% community
Bacteroidetes	46.84^a	20.78^b	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	1.41^x	0.11^y	1.79^x	0.69^y	0.22	< 0.01	0.06	0.68
Tenericutes	1.85^x	0.45^y	1.84^x	1.06^y	0.24	< 0.01	0.24	0.22
Cyanobacteria	1.05^a	0.41^b	0.60^a	0.44^b	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	0.049^a	0.009^b	0.01	0.25	0.13	0.05
Elusimicrobia	0.033^a	0.002^b	0.042^a	0.005^b	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

¹SEM standard error of mean
^{a, b}LSmeans with different letters within SCFP treatment (No SCFP or SCFP) differ (P < 0.05)
^{x, y}LSmeans with different letters within SCFP treatment (No SCFP or SCFP) tend to differ (P < 0.10)

ISSN: 1746-6148