Table 1. The estimation of minimum required number in this study.

County	Expect prevalence		Desire prevalence		Minimum require number
	Cow	Sheep	Cow	Sheep	Cow	Sheep
X	9.5%	8.3%	2%	3%	150	296
H	8.1%	6.7%	2%	3%	201	316
Q	5.5%	8.8%	1.5%	3%	330	261