Table 4 Effect of Api-PR19 and antibiotic on the conditioned pathogen abundance and the microbiota of broilers’ gut

21 d

Total bacteria

16.47

16.63

16.80

0.15

0.704

Escherichia coli

12.74

12.51

12.94

0.23

0.338

Bifidobacterium bifidum

13.20

13.85

13.44

0.18

0.391

Salmonella gallinarum

13.17

13.42

13.40

0.24

0.925

Campylobacter jejuni

11.16

11.84

11.65

0.19

0.419

42 d

Total bacteria

14.93^a

14.04^b

14.48^ab

0.14

0.019

Escherichia coli

9.92^a

8.54^b

8.46^b

0.25

0.011

Bifidobacterium bifidum

13.36

12.62

12.96

0.15

0.138

Salmonella gallinarum

12.98

12.58

12.55

0.11

0.256

Campylobacter jejuni

11.84^a

10.83^b

11.49^ab

0.18

0.043

42 d

α-diversity

Observed species

2947.60

3124.60

2955.80

104.89

0.767

Shannon

8.20

8.34

8.35

0.13

0.888

Simpson

0.972

0.974

0.980

0.005

0.801

Chao1

3928.21

4158.35

3883.47

142.29

0.730

Goods coverage

0.976

0.974

0.978

0.0016

0.641