Table 2.
Detection rate of Salmonella spp. in conventional and welfare poultry broiler farms in this study

Farms	Sampling sites
	No. of positive samples/No. of tested samples
Conventional broiler	Farm	Water nipple	Feeder	Fan		Heater	Wall	Door	Total	Serotype
	P	0/4	0/4	0/3		0/2	1/6	0/1	1/20	UD1
	Q	1/4	0/4	0/3		0/2	1/6	0/1	2/20	UD
	R	0/4	0/4	0/3		0/2	1/6	0/1	1/20	SS2
	S	0/4	0/4	0/3		1/2	0/6	0/1	1/20	UD
	T	0/4	0/4	0/3		0/2	0/6	0/1	0/20	-
	U	0/4	0/4	0/3		0/2	0/6	0/1	0/20	-
	V	0/4	0/4	0/3		0/2	0/6	0/1	0/20	-
	W	0/4	0/4	0/3		0/2	0/6	0/1	0/20	-
	X	0/4	0/4	0/3		0/2	0/6	0/1	0/20	-
	Y	0/4	0/4	0/3		1/2	1/6	0/1	2/20	SE3 (n=1) UD (n=1)
	Total	1/40	0/40	0/30		2/20	4/60	0/10	7/200*	-
Welfare broiler	Farm	Water nipple	Feeder	Fan	Heater	Wall	Door	Perch	Total	Serotype
	K	2/6	3/6	1/4	1/4	3/14	0/2	0/4	10/40	SG4 (n=1) SV5 (n=1) UD (n=8)
	L	0/6	2/6	2/4	0/4	0/14	/0/2	2/4	6/40	UD
	M	1/6	1/6	1/4	0/4	1/14	0/2	0/4	4/40	UD
	N	0/6	0/6	0/4	0/4	0/14	0/2	0/4	0/40	-
	O	0/6	1/6	0/4	0/4	0/14	0/2	0/4	0/40	-
	Total	3/30	7/30	4/20	1/20	4/70	0/10	2/20	21/200*	-

Undetermined,
Salmonella enterica subsp. Senftenberg
Salmonella enterica subsp. Enteritidis
Salmonella enterica subsp. Grampian
Salmonella enterica subsp. Virchow.
P value was 0.0057, and there is statistical difference between the conventional layer farms and the welfare layer farms if the P value is less than 0.05.