Table 1.

Operational taxonomic units (OTUs) of archaeal 16S rRNA gene sequences from colonic digesta of piglets and finishers

OTU#	#Phylotype	#Sequence	Nearest Valid Taxona	% Sequence Identity
1	1	28	Methanobrevibacter smithii	99.1
2	1	4	Methanobrevibacter millerae	98.7
3	1	3	Methanobrevibacter millerae	98.1
4	2	7	Methanobrevibacter millerae	98.6
5	1	8	Methanobrevibacter boviskoreani	99.4
6	2	5	Methanobrevibacter millerae	98.2
7	1	27	Methanomassiliicoccus luminyensis	86.6
8	1	1	Methanobrevibacter ruminantium	96.9
9	1	2	Methanobrevibacter boviskoreani	99.7
10	2	11	Methanobrevibacter millerae	98.3
11	1	16	Methanomassiliicoccus luminyensis	84.6
12	1	4	Methanobrevibacter ruminantium	96.4
13	1	3	Methanobrevibacter ruminantium	97.7
14	2	18	Methanobrevibacter millerae/Methanobrevibacter smithii	96.7
15	1	15	Methanomassiliicoccus luminyensis	88.0
16	1	1	Methanobrevibacter millerae	95.5
17	4	33	Methanomassiliicoccus luminyensis	88.2
18	1	2	Methanomassiliicoccus luminyensis	87.3
19	1	8	Methanomassiliicoccus luminyensis	84.3
20	2	5	Methanomassiliicoccus luminyensis	87.4
21	1	2	Methanobrevibacter millerae	96.1
22	1	5	Methanobrevibacter gottschalkii	97.9
23	1	4	Methanobrevibacter gottschalkii	97.5
24	1	1	Methanobrevibacter gottschalkii	97.6
25	5	33	Methanobrevibacter millerae	98.4
26	9	23	Methanobrevibacter millerae	97.8
27	4	14	Methanobrevibacter gottschalkii	98.3
28	10	59	Methanobrevibacter ruminantium	98.9
29	1	19	Methanomassiliicoccus luminyensis	86.7
30	100	353	Methanobrevibacter millerae/Methanobrevibacter gottschalkii	98.6
31	6	52	Methanobrevibacter olleyae/Methanobrevibacter millerae/Methanobrevibacter smithii	96.1
32	1	9	Methanobrevibacter gottschalkii	98.3
Totals	168	775

^aNearest valid taxon with the same name means the same strain