Table 2.

Phylum-level composition of the rumen samples from different groups of heifers (relative abundance ≥0.1%)

Phylum	Treatments			SEM	P
	L	M	H		Treatment	Age	Treatment × Age
Actinobacteria	1.97	1.63	1.33	0.0010	0.0690	0.0014	0.0989
Bacteroidetes	20.8	23.44	18.69	0.0114	0.2825	< 0.0001	0.9667
Chloroflexi	0.29	0.24	0.21	0.0003	0.1783	0.0004	0.1384
Firmicutes	54.69	54.79	51.62	0.0065	0.1295	< 0.0001	0.3535
Proteobacteria	13.41	10.76	15.57	0.0205	0.6438	0.0002	0.6974
Spirochaetes	0.10	0.10	0.08	0.0001	0.7489	0.0001	0.3636
Tenericutes	2.03	1.99	2.04	0.0017	0.9897	< 0.0001	0.1050
TM7	2.42	2.1	2.04	0.0016	0.6041	0.0191	0.3990