Table 4.

Relative abundance of major bacterial groups in the jejunum at d 1, 5 and 14

Phylum	Class	Family	WA1a	WA5	A5b	WA14	A14
Firmicutes	Bacilli	Enterococcaceae	25.9 c	21.7	25.2	4.9	9.9
Firmicutes	Bacilli	Lactobacillaceae	0.5	77.9	74.2	82.2	70.5
Firmicutes	Bacilli	Leuconostocaceae	<0.01	0.04	0.08	0.1	0.2
Firmicutes	Bacilli	Streptococcaceae	0.4	0.2	0.3	8.9	11.9
Firmicutes	Clostridia	Clostridiaceae	6.0	<0.01	0.01	0.2	0.2
Firmicutes	Clostridia	Otherd	<0.01	<0.01	0.02	0.4	0.7
Firmicutes	Erysipelotrichi	Erysipelotrichaceae	<0.01	0.05	0.05	0.04	0.7
Tenericutes	Mollicutes		<0.01	<0.01	<0.01	0.02	1.1
Proteobacteria	Gammaproteobacteria	Enterobacteriaceae	61.1	0.05	0.04	3.0	3.2
Unclassified			3.5	<0.01	<0.01	<0.01	0.2
Other			1.9	<0.01	<0.01	<0.01	0.1
Total			99.3	99.9	99.9	99.7	98.6

^a,b Abbreviations: WA1 without antibiotic day 1; WA5 without antibiotic day 5; A5 with antibiotic day 5; WA14 without antibiotic day 14; A14 with antibiotic day 14

^caverage relative contribution of 8 pools consisting of 10 chicken

^dOther is a limitation of the underlying bioinformatics tool to further classify this as a certain family

In bold are the two most dominant families per time-point