|
|||||
|
|
Factors associated with being a bovine-virus diarrhoea (BVD) seropositive dairy herd in the M[oslash]re and Romsdal County of Norway |
|
| Authors: | P S Valle S W Martin R Tremblay and K Bateman |
| Institution: | a Norwegian School of Veterinary Science, Post Box 8146 Dep., 0033 Oslo, Norway b Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada, NIG 2W1 c Ontario Ministry of Food and Rural Affairs, R.R. #1, Fergus, Ontario, Canada, NIM 2W3 |
| Abstract: | Factors associated with being a bovine-virus diarrhoea (BVD) seropositive dairy herd were studied in a case-control study of 314 dairy herds in the Moslash]re and Romsdal County of Norway. Information was collected through a mailed questionnaire, and associations were modeled using conditional logistic regression after selecting variables by a best-subset procedure. Purchasing of animals, use of common pasture, herd-to-herd contact over pasture fences, purchasing cattle with insufficient health (about BVD) documentation, and not using dairy advisors were associated with higher risk. In addition, younger farmers were more likely to have a bovine-virus diarrhoea seropositive herd than older farmers. ‘Other animal traffic', including use of common animal housing in the summer months and exchange of calves between farmers were also risk factors. Collectively, these factors could explain 51% of the seropositive herds. |
| Keywords: | Bovine-virus diarrhoea Cattle-microbiological disease Risk factors Case-control study Frequency matching Conditional maximum likelihood Logistic regression |
| 本文献已被 ScienceDirect 等数据库收录！ | |