Sample

Positive/total^a

%

Negative/total^b

%

Meat meal

88/166

53

78/166

47

Feather meal

15/24

62.5

9/24

37.5

Organ meal

16/43

37.2

27/43

62.8

Feed

23/121

19

98/121

81

Regulament [18]

Limit acceptable

Absence