[Clinical forms of enzootic pneumonia in calves and their effects on respiration]

Enzootic pneumonia was diagnosed in 160 of 225 bullocks in a livestock fattening unit. Within the first 10 weeks, 51 of those affected contracted the disease a second time after the symptoms had vanished. Acute catarrhal bronchopneumonia were most common (49.3%) during the first outbreak, whereas acute catarrhal purulent bronchopneumonia (39.2%) and chronic pneumonia (29.4%) were most common during the second. Arterial blood gas analysis was undertaken for 33 clinically healthy bullocks and 100 bullocks with clinically diagnosed acute bronchitis, acute catarrhal bronchopneumonia, acute catarrhal purulent bronchopneumonia and chronic pneumonia. The pO2, SATO2 and A-aDO2 levels found in blood from the abdominal aorta of all diseased animals differed significantly from those of healthy animals. The values for animals with distinct catarrhal bronchopneumonia and catarrhal purulent bronchopneumonia showed the greatest differences.