TABLE 4:
Ewe losses by SBV confirmed, SBV suspected and SBV not suspected
| Valid responses to question/denominator | ||||||||
|---|---|---|---|---|---|---|---|---|
| SBV confirmed by PCR | SBV suspected | SBV not suspected | ||||||
| Q number | Summary description | n=76† | Per cent | n=141† | Per cent | n=278† | Per cent | P value* |
| 19 | Number of ewes that produced at least one deformed lamb | < 0.001 | ||||||
| 0 | 8/68 | 11.8 | 42/133 | 1.6 | 200/232 | 86.2 | ||
| 1–5 | 44/68 | 64.7 | 70/133 | 52.6 | 30/232 | 12.9 | ||
| 6–10 | 7/68 | 10.3 | 11/133 | 8.3 | 0/232 | 0 | ||
| 10 | 9/68 | 13.2 | 10/133 | 7.5 | 2/232 | 0.9 | ||
| 21 | Number of ewes assisted by a vet because of a deformed lamb | < 0.001 | ||||||
| 0 | 43/67 | 64.2 | 95/118 | 80.5 | 180/189 | 95.2 | ||
| 1 | 15/67 | 22.4 | 17/118 | 14.4 | 7/189 | 3.7 | ||
| 1 | 9/67 | 13.4 | 6/118 | 5.1 | 2/189 | 1.1 | ||
| 21 | Caesarean sections because of a deformed lamb | 0.002 | ||||||
| 0 | 57/65 | 87.7 | 104/117 | 89 | 181/184 | 98.4 | ||
| 1 | 7/65 | 10.8 | 9/117 | 7.6 | 1/184 | 0.5 | ||
| 1 | 1/65 | 1.5 | 4/117 | 3.4 | 2/184 | 1.1 | ||
| 22 | Number of breeding ewes that died during the lambing period | < 0.001 | ||||||
| 0 | 22/66 | 33.3 | 46/140 | 32.9 | 107/235 | 45.5 | ||
| 1–5 | 33/66 | 50 | 62/140 | 44.3 | 93/235 | 39.6 | ||
| 6–10 | 3/66 | 4.6 | 17/140 | 12.1 | 13/235 | 5.5 | ||
| 10 | 8/66 | 12.1 | 15/140 | 10.7 | 22/235 | 9.4 | ||
| 22 | Number of ewes that died giving birth to a deformed lamb | < 0.001 | ||||||
| 0 | 41/65 | 63.1 | 109/131 | 83.2 | 205/221 | 92.8 | ||
| 1 | 11/65 | 16.9 | 6/131 | 4.6 | 6/221 | 2.7 | ||
| 1 | 13/65 | 20 | 16/131 | 12.2 | 10/221 | 4.5 | ||
| 22 | Number of ewes lost during the lambing period per 100 ewes | |||||||
| Number of responses | 64 | 134 | 232 | |||||
| Median | 1.1 | 0.9 | 0.5 | |||||
| Min | 0 | 0 | 0 | |||||
| Max | 72 | 33.3 | 31.9 | |||||
| IQR | 0 to 2.8 | 0 to 2.8 | 0 to 1.7 | |||||
| 22 | Number of ewes lost because of deformed lamb at birth per 100 ewes | |||||||
| Number of responses | 63 | 128 | 219 | |||||
| Median | 0 | 0 | 0 | |||||
| Min | 0 | 0 | 0 | |||||
| Max | 7.8 | 17.8 | 4.7 | |||||
| IQR | 0 to 0.5 | 0 to 0 | 0 to 0 | |||||
*The number of responders within each subgroup is shown at the top of the tables. As not all questions were answered by each farmer, the number of responses per question is displayed
†χ2 and Fisher's exact tests were conducted for comparing questionnaire results between SBV groups. Geometric means of continuous variables with skewed distributions were compared. Results were considered statistically significant where the P value was <0.05
SBV, Schmallenberg virus