Diseases and pathogens associated with mortality in Ontario beef feedlots.
This study determined the prevalence of diseases and pathogens associated with mortality or severe morbidity in 72 Ontario beef feedlots in calves that died or were euthanized within 60 days after arrival. Routine pathologic and microbiologic investigations, as well as immunohistochemical staining for detection of bovine viral diarrhea virus (BVDV) antigen, were performed on 99 calves that died or were euthanized within 60 days after arrival. Major disease conditions identified included fibrinosuppurative bronchopneumonia (49%), caseonecrotic bronchopneumonia or arthritis (or both) caused by Mycoplasma bovis (36%), viral respiratory disease (19%), BVDV-related diseases (21%), Histophilus somni myocarditis (8%), ruminal bloat (2%), and miscellaneous diseases (8%). Viral infections identified were BVDV (35%), bovine respiratory syncytial virus (9%), bovine herpesvirus-1 (6%), parainfluenza-3 virus (3%), and bovine coronavirus (2%). Bacteria isolated from the lungs included M. bovis (82%), Mycoplasma arginini (72%), Ureaplasma diversum (25%), Mannheimia haemolytica (27%), Pasteurella multocida (19%), H. somni (14%), and Arcanobacterium pyogenes (19%). Pneumonia was the most frequent cause of mortality of beef calves during the first 2 months after arrival in feedlots, representing 69% of total deaths. The prevalence of caseonecrotic bronchopneumonia caused by M. bovis was similar to that of fibrinosuppurative bronchopneumonia, and together, these diseases were the most common causes of pneumonia and death. M. bovis pneumonia and polyarthritis has emerged as an important cause of mortality in Ontario beef feedlots.
Department of Pathobiology, Ontario Veterinary College, Canada.
Mihai I
MI
Gagea
Kenneth G
KG
Bateman
Tony
T
van Dreumel
Beverly J
BJ
McEwen
Susy
S
Carman
Marie
M
Archambault
Rachel A
RA
Shanahan
Jeff L
JL
Caswell
D000818:Animals; D000956:Antigens, Viral / Q000032:analysis; D001424:Bacterial Infections / Q000175:diagnosis / Q000401:mortality / Q000662:veterinary*; D048090:Bovine Respiratory Disease Complex / Q000382:microbiology / Q000401:mortality* / Q000821:virology; D002417:Cattle; D002418:Cattle Diseases / Q000175:diagnosis / Q000382:microbiology / Q000401:mortality*; D001908:Diarrhea Viruses, Bovine Viral / Q000276:immunology / Q000302:isolation & purification; D044138:Haemophilus somnus / Q000276:immunology / Q000302:isolation & purification; D007150:Immunohistochemistry / Q000662:veterinary; D016978:Mannheimia haemolytica / Q000276:immunology / Q000302:isolation & purification; D045682:Mycoplasma bovis / Q000276:immunology / Q000302:isolation & purification; D009205:Myocarditis / Q000382:microbiology / Q000401:mortality / Q000662:veterinary; D009864:Ontario / Q000453:epidemiology; D014765:Viral Vaccines; D014777:Virus Diseases / Q000175:diagnosis / Q000401:mortality / Q000662:veterinary*
D000956:Antigens, Viral; D014765:Viral Vaccines