Table 3.

Effects of essential oils on populations of ruminal bacteria in the phylum Bacteroidetes and Spirochaetes [only the OTUs with significant (P ≤ 0.05) changes in relative abundance are shown].

Bacterial OTU	RDP ID	C	ORO	GAO	PEO	SEM	P-value
Parabacteroides_1	S001542581	0.07a	0.00a	0.11a	0.82b	0.166	0.026
U_Porphyromonadaceae_16	S000704965	0.44a	0.55a	0.28a	2.78b	0.089	<0.001
U_Porphyromonadaceae_33	S001144889	0.10a	0.02a	0.01a	1.24b	0.162	0.002
Prevotella_115	S000336511	0.33a	0.57a	0.34a	1.12b	0.125	0.007
Prevotella_143	S001148780	0.41a	1.63b	0.12a	0.06a	0.360	0.048
Prevotella_178	S000959442	0.51a	0.85a	0.66a	1.79b	0.278	0.045
Prevotella_195	S000566509	3.00a	7.03ab	3.75a	14.57b	2.504	0.040
Prevotella_2	S000991225	0.18a	0.22a	0.13a	1.00b	0.044	<0.001
Prevotella_26	S000336499	0.05a	0.14a	0.13a	0.93b	0.178	0.025
Prevotella_68	S000823675	0.23a	0.69a	0.50a	3.12b	0.329	0.001
Prevotella_74	S000821891	1.90a	2.68a	3.25a	13.00b	1.796	0.007
U_Prevotellaceae_24	S000407047	0.32a	1.31b	0.33a	0.27a	0.252	0.050
U_Prevotellaceae_31	S000508055	0.47ab	1.25bc	0.16a	1.49c	0.254	0.018
U_Prevotellaceae_34	S000508062	0.40ab	2.50c	0.20a	1.28bc	0.499	0.041
U_Bacteroidales_170	S000991291	1.45a	2.55ab	1.06a	3.78b	0.528	0.026
U_Bacteroidales_26	S000361598	0.09a	0.08a	0.21a	5.74b	0.086	<0.001
U_Bacteroidales_29	S000361651	17.04a	34.97b	14.70a	19.49a	4.576	0.050
U_Bacteroidales_55	S000566697	0.26a	0.58b	0.14a	2.22c	0.091	<0.001
U_Bacteroidales_61	S001143822	0.55a	1.25ab	0.76a	2.02b	0.323	0.050
U_Bacteroidales_63	S000566794	1.24a	6.59b	0.65a	0.63a	1.286	0.030
U_Bacteroidales_75	S000650445	0.07a	0.00a	0.00a	2.25b	0.083	<0.001
U_Bacteroidales_76	S000650383	0.25a	0.37a	0.18a	1.22b	0.097	<0.001
U_Bacteroidetes_18	S000361599	0.21a	0.46a	0.14a	1.93b	0.099	<0.001
U_Bacteroidetes_25	S000404396	0.07a	0.06a	0.05a	0.95b	0.056	<0.001

U, unclassified; C, control (without any essential oil); GAO, garlic oil; PEO, peppermint oil; ORO, origanum oil.

Means followed by different letters in a row differ significantly (P ≤ 0.05) among the treatments.