| the frequency, distribution and effects of antibodies, to seven putative respiratory pathogens, on respiratory disease and weight gain in feedlot calves in ontario. | during 1983-85, 279 calves requiring treatment for bovine respiratory disease and 290 comparison (control) animals from 15 different groups of feedlot calves were bled on arrival and again at 28 days postarrival. their sera were then analyzed for antibodies to seven putative respiratory pathogens. on arrival, the prevalences of indirect agglutination titers to pasteurella haemolytica, p. haemolytica cytotoxin, mycoplasma bovis and m. dispar were greater than 50%, the prevalence of titers to bovi ... | 1989 | 2766158 |
| some respiratory and enteric diseases of cattle: an update. | fibrinous pneumonia caused 40-45% of death losses in cattle shipped into bruce county, ontario. feeding corn silage within the first 2 weeks of arrival increased mortality. commingling cattle from different sources and keeping more than 110 cattle in a pen were detrimental. while use of antimicrobials in the starter ration was beneficial, prophylactic use of antimicrobials in the water was not. mortality was directly proportional to morbidity and treatment costs. vaccinating against any respirat ... | 1984 | 6738491 |
| 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 fibrinos ... | 2006 | 16566254 |