Table 3 The prevalence of lung lesions and mean percentage of the total lung volume with uncomplicated and complicated catarrhal pneumonia lesions (volume %) at slaughter

N^* lungs obtained

285

283

299

324

306

334

N uncomplicated catarrhal pneumonia (%)

130^b

152^a

161^a**

51^b

104^a

127^a (38.0)

(45.6)

(53.7)

^*(53.9)

(15.7)

(34.0)

N complicated catarrhal pneumonia (%)

0

2

4

1

8

1

(0)

(0.7)

(1.3)

(0.3)

(2.6)

(0.3)

N fissures (%)

53^a (18.6)

53^a (18.7)

50^a (16.7)

63^b (19.4)

86^a (28.1)

104^a (31.1)

N of pigs with at least one M. hyopneumoniae like lung lesion (%)

156^b (54.7)

171^a (60.4)

189^a (63.2)

105^b (32.4)

159^a ( 52.0)

185^a (55.4)

Volume (%) (sd)^***

9.0^b

10.7^a

11.9^a

6.3^b

8.6^a

9.0^a

(7.1)

(8.4)

(9.1)

(4.4)

(6.7)

(7.6)