Table 1.
Detection rate of Salmonella spp. in conventional and welfare poultry layer farms in this study

Farms	Sampling sites
	No. of positive samples / No. of tested samples
Conventional layer farms	Farm	Feeder	ECB1	Ground	Fan	MB2	Wall	Total	Serotype
	F	0/6	0/6	0/6	0/6	0/4	0/2	0/30	-
	G	0/2	0/2	0/2	0/2	0/2	-	0/10	-
	H	0/2	0/2	0/2	0/2	0/2	-	0/10	-
	I	0/6	0/6	0/6	0/6	0/4	0/2	0/30	-
	J	0/6	0/6	0/6	0/6	0/6	0/2	0/30	-
	Total	0/22	0/22	0/22	0/22	0/16	0/6	0/110*
Welfare layer farms	Farm	Nest	Perch	Feeder	Water nipple	SF3	Fan	Total	Serotype
	A	0/6	0/6	0/6	0/6	0/4	0/2	0/30	-
	B	0/6	0/6	0/6	1/6	0/4	0/2	1/30	SE4 (n=1)
	C	0/6	0/6	0/6	0/6	0/4	0/2	0/30	-
	D	0/2	0/2	0/2	0/2	0/2	-	0/10	-
	E	0/6	0/6	0/6	0/6	0/4	0/2	0/30	-
	Total	0/26	0/26	0/26	1/26	0/18	0/8	1/130*

Egg conveyer belt
Manure belt
Slatted floor
Salmonella enterica subsp. Enteritidis.
P value was 1.00, and there is statistical difference between the conventional layer farms and the welfare layer farms if the P value is less than 0.05.