| bovine coronaviruses associated with enteric and respiratory diseases in canadian dairy cattle display different reactivities to anti-he monoclonal antibodies and distinct amino acid changes in their he, s and ns4.9 protein. | bovine coronavirus isolates associated with recent outbreaks of respiratory disease in ontario and quebec dairy farms were compared to reference strains known to be responsible for neonatal calf diarrhea (ncd) or winter dysentery (wd) of adult cattle. in respect to their hemagglutinating properties and their higher rde activities with rat erythrocytes, wdbcov strains differed from ncdbcov strains and respiratory bovine coronaviruses rbcov strains. serologically, three mabs directed to the he gly ... | 2001 | 11376845 |
| 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 |
| calf-level risk factors for neonatal diarrhea and shedding of cryptosporidium parvum in ontario dairy calves. | this work was conducted to investigate calf-level factors that influence the risk of neonatal diarrhea and shedding of cryptosporidium parvum oocysts in calves, on dairy farms in ontario with histories of calf diarrhea or cryptosporidiosis. fecal samples were collected weekly for 4 weeks from each of 1045 calves under 30 days of age on 11 dairy farms in south-western ontario during the summer of 2003 and the winter of 2004. a questionnaire designed to gather information on calf-level management ... | 2007 | 17602767 |