Table 3.

Mean optical density ratios (ODR) for Ostertagia ostertagi based on bulk milk assay

Country	Number of herds pastured/total	Mean ODR	Reference
Denmark	146/146	0.48	[29]
Germany	78/131	0.48	[29]
Italy	47/140	0.31	[29]
Netherlands	243/288	0.45	[29]
Portugal	92/163	0.61	[29]
Spain	91/143	0.53	[29]
UK/Ireland	142/174	0.60	[29]