Atypical interstitial pneumonia in yearling feedlot cattle
Jensen, R.; Pierson, R.E.; Braddy, P.M.; Saari, D.A.; Lauerman, L.H.; England, J.J.; Benitez, A.; Horton, D.P.; McChesney, A.E.
Journal of the American Veterinary Medical Association 169(5): 507-510
1976
ISSN/ISBN: 0003-1488 PMID: 956028 Document Number: 104323
From 3943 fatalities among 407 000 cattle, 1988 necropsies were made; of this number, 106 (5.3%) had atypical interstitial pneumonia. The death rate was higher during summer and autumn than during the other seasons and was evenly distributed throughout each of the 4 stages of fattening. Gross pulmonary lesions involved both lungs and were prominent throughout the caudal (diaphragmatic) lobes. Epithelialization, haemorrhage, fibrin, hyaline membranes, emphysema, bronchiolitis, and interstitial oedema were common, whereas chromatin strands, bronchiolar oedema, interstitial emphysema, and obliterating bronchiolitis were less common histological features.