Status, evaluation, and influencing factors of biosecurity levels in pig farms in China

BMC Veterinary Research

Table 4 Internal and external biosecurity of farms

Variable	Classification	Sample size	Proportion/%	Variable	Classification	Sample Size	Proportion/%
Distance from other farms	[0,0.3) km	82	33.33	Distance from residential area	[0,0.3) km	79	32.11
	[0.3,3) km	102	41.47		[0.3,3) km	144	58.54
	[3,10) km	51	20.73		[3,10) km	21	8.54
	[10,100] km	11	4.47		[10,35] km	2	0.81
Distance from traffic trunk line	[0,0.3) km	48	19.51	Fattening pigs all in and all out	Yes	83	33.74
	[0.3,3) km	141	57.32	Fattening pigs all in and all out	No	163	66.26
	[3,10) km	45	18.29	Immune record	Built	216	87.80
	[10,20] km	12	4.88	Immune record	Not under construction	30	12.20
Are there natural barriers around the farm (rivers, mountains, farmland)?	Yes	179	72.76	Does the farm manage sows, fattening pigs, and piglets by district?	Yes	200	81.30
	No	67	27.24		No	46	18.70
Is the means of transport special or exclusive?	Yes	177	71.95	Are clean roads and sewage roads separated in the field?	Yes	204	82.93
Is the means of transport special or exclusive?	No	69	28.05	Are clean roads and sewage roads separated in the field?	No	42	17.07
Has the water source been tested?	Yes	109	44.31	Is drinking water disinfected?	Yes	90	36.59
Has the water source been tested?	No	137	55.69	Is drinking water disinfected?	No	156	63.41

ISSN: 1746-6148