Table 1. Mean sample proportion of bacterial phyla by study group (Pp, primiparous and Mp, multiparous) and study day (S1, 3 weeks prior to calving; S2, 1–3 days after calving) in Roche 454 and Ion Torrent samples.

Phylum	Platform	Study group (SG)		Study day (SD)		P-value
		Pp	Mp	S1	S2	PSG	PSD	PSG∗SD
Bacteroidetes	Roche 454	0.8450	0.7700	0.7640	0.8400	**	***	***
	Ion Torrent	0.7613	0.7032	0.6940	0.7610	*	***	***
Cyanobacteria	Roche 454	0.0040	0.0030	0.0060	0.0020		***	**
	Ion Torrent	0.0069	0.0050	0.0077	0.0047
Fibrobacteres	Roche 454	0.0110	0.0150	0.0140	0.0110	**	***	***
	Ion Torrent	0.0082	0.0115	0.0086	0.0108			***
Firmicutes	Roche 454	0.0800	0.1060	0.1200	0.0730		***	***
	Ion Torrent	0.1164	0.1420	0.1492	0.1142		***
Proteobacteria	Roche 454	0.0080	0.0200	0.0150	0.0140	***	**	**
	Ion Torrent	0.0096	0.0097	0.0105	0.0090
Spirochaetes	Roche 454	0.0010	0.0040	0.0030	0.0020	**
	Ion Torrent	0.0035	0.0073	0.0067	0.0044
Tenericutes	Roche 454	0.0050	0.0110	0.0120	0.0050			*
	Ion Torrent	0.0094	0.0109	0.0136	0.0076		**
TM7	Roche 454	0.0030	0.0050	0.0050	0.0040	**	*	*
	Ion Torrent	0.0050	0.0089	0.0093	0.0052	*	**

Notes.

The magnitude of the p-values for the effect of study group (P_SG), study day (P_SD), and the interaction term (P_SG∗SD) are shown on the right.

^***P < 0.001.

^**P < 0.01.

^*P < 0.05.