Table 2.

OTUs contributing significantly to differences in microbial communities between chicks on control versus antimicrobial-supplemented diets

Age of birda (days)	Treatment differing from control	Discriminating OTU(s) for groupb
		Control	Antimicrobial treated
Ileum
3	Avilamycin	220	60, 86, 492, 518, 536, 560/562
	Flavophospholipol	220	86, 180, 186, 492, 518, 560, 566
5	Flavophospholipol	186, 574	176, 180, 210/212, 566, 938
7	Flavophospholipol	186/188, 574	170, 178, 184, 210, 248
10	Flavophospholipol	186, 574	178/180, 212, 936
12	Avilamycin	186, 284/286, 936	152, 176, 212, 574
	Flavophospholipol	186, 284/286, 894	152, 170, 176/178, 212, 936
	Zinc bacitracin	78, 86, 186, 284/286, 894	152, 176, 178/180, 212
14	Avilamycin	86, 284/286, 574, 894	70, 180, 566
	Flavophospholipol	86, 284/286, 894	70, 80, 180, 518, 566
	Zinc bacitracin	86, 284/286, 574, 894	70, 178/180, 566
17	Avilamycin	86, 186/188, 284/286, 574, 894, 936	70, 178/180, 566
	Flavophospholipol	86, 186/188, 284/286, 574, 894	70, 178/180, 566, 936
Ceca
3	Zinc bacitracin	220	198, 910
5	Avilamycin	140/142, 180, 286/288, 296, 482
	Flavophospholipol	140/142, 286/288, 290, 296, 480/482, 564	178/180, 200, 216/218, 476
7	Flavophospholipol	140/142	178/180, 198/200, 286, 476, 520, 564
17	Avilamycin	78, 144/146, 284/286, 296/298, 482, 536, 910	68, 140/142, 198, 216/218, 520
	Flavophospholipol	78, 140/142, 144/146, 284/286, 536, 910	216, 294, 310, 490

^aAge groups where significant differences between control and antimicrobial treatment groups were detected in gut microbial community compositions as determined by ANOSIM (Table 1).

^bOTUs identified by SIMPER as significantly discriminating between control and antimicrobial treatment groups. OTUs identified as being more abundant within a particular treatment group are indicated. OTUs in boldface type have been cloned and sequenced.