DIFFERENTIAL-DIAGNOSIS, TREATMENT AND PRE VENTION OF RESPIRATORY-DISEASE OF CALVES

Enzootic respiratory disease of calves is typified by a similarity in the clinical signs, a peracute to an acute presentation of disease and mixed infections. The immediate treatment of acute cases is necessary to minimise the medical and economic effects. There is also a need to identify the causal agent from analysis of the complex of clinical si gns and to determine the location of the lesions and the degree of inf lammation. An analysis of affected calves from 12 herds produced the f ollowing results. One case of >>rhinopharyngolaryngitis<< in a 5 day o ld calf with deep inspiratory dyspnoea infected with bovine entero-vir us. Two cases of interstitial pneumonia in 5 day old calves with an ac ute high intensity hyperpnoea following infection with parainfluenza-3 and chlamydia. Six cases of >>exudative catarrhal bronchopneumonia<< with deep long inspiration infected with PI-3 and the initial stages o f a pasteurella infection. Two cases of >>catarrhal purulent/fibrinous bronchopneumonia<< with deep expiratory dyspnoea as a result of infec tion with Pasteurella multocida and one case of >>peracute catarrhal b ronchopneumonia<< with deep expiratory dyspnoea and the typical clinic al signs of >>cattlegrippe<<.