Martin et al 1986 [40]
|
322 calves, Small pen research feedlots in Ontario |
55.8% |
No |
24% |
Yes |
Martin et al 1989 [41]
|
279 cases of BRD and 290 controls from small pen research feedlots in Ontario |
32% in cases 42% in controls |
Yes |
42% in cases 33% in controls |
Yes |
Durham et al 1991 [42]
|
283 bull calves at Saskatchewan bull test station |
21% |
Yes |
13% |
No |
Allen et al 1992 [43]
|
59 cases of BRD and 60 controls from small pen research feedlot in Ontario |
Not applicable |
N/A |
51% |
No |
Martin et al 1999 [44]
|
700 calves from 32 groups from feedlots in Ontario and Alberta |
24% |
Yes |
50% |
Yes |
Booker et al 1999 [45]
|
200 head case control study from 22,000 head commercial lot in Alberta |
Not calculated |
Yes |
Not calculated |
Yes |
Fulton et al 2000 [46]
|
120 Tennessee calves shipped to Texas |
18.3% BVDV type 1 13.3% BVDV type 2 |
N/A virtually all calves treated |
38.5% BVDV type 1 27.9% BVDV type 2 |
N/A |
O'Connor et al 2001 [47]
|
852 calves from 3 Ontario feedlots |
39% |
Yes |
45% |
Yes |
Fulton et al 2002 [48]
|
Two groups of calves: 205 calves and 120 calves from Tennessee |
23.1–34.2% BVDV type 1a 17.4–20.0% BVDV type 2 |
Not calculated |
Sick calves: 32.8–47.5% BVDV 1a Healthy calves: 16–28.4% BVDV 1a |
Yes |