|
Relative risk (odds ratio) for trichostrongyle infections and the quantitative egg output in relation to different variables. Single regression model on ± trichostrongyle faecal egg positive animals. Differences between related figures are statistically significant (p < 0.05). |
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| Categories, examined animals and variables |
Relative risk of infection |
EPG |
|
|
|
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| Odds ratio |
95% Cl |
Geometric mean |
|
|
|
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| Lambing time |
|||
| Ewes soon after lambing |
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| Winter |
1 |
- |
13 |
| Spring |
8.3 |
3.4 – 20.1 |
123 |
| High EPG – values |
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| Ewes soon after lambing |
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| Haemonchus negative flocks |
1 |
- |
118 |
| Haemonchus positive flocks |
26 |
10 – 71 |
776 |
| Different sampling times in the same flocks |
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| Lambs in Sept. – Oct. |
1 |
- |
37 |
| Lambs in Nov. |
5.0 |
2.8 – 8.7 |
213 |
| Slaughtering time |
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| Lambs in Sept. – Oct. |
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| All lambs slaughtered before Dec. 1 |
1 |
- |
10 |
| ≥ 1% of the lambs slaughtered after Dec 1. |
3.9 |
2.5 – 6.1 |
83 |
| Accommodation from birth to turn out in spring |
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| Lambs after appr. 4 weeks grazing |
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| Stable – new grazing area |
1 |
- |
3 |
| Stable – old grazing area |
3.8 |
2.4 – 5.9 |
22 |
| Winter area – new grazing area |
2.3 |
1.6 – 3.3 |
10 |
| Winter area – old grazing area |
9.1 |
5.6 – 14.6 |
63 |
| Permanent outdoors |
3.9 |
2.4 – 6.3 |
25 |
| Pasture managament |
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| Ewes not dewormed |
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| Lambs after appr. 4 weeks grazing |
|||
| New grazing area |
1 |
- |
4 |
| Old grazing area |
5.9 |
4.3 – 7.9 |
53 |
| Ewes dewormed before turn out |
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| Lambs after appr. 4 weeks grazing |
|||
| New grazing area |
1 |
- |
4 |
| Old grazing area |
4.9 |
2.4 – 10.0 |
45 |
| Lambs in Sept. – Oct. |
|||
| New spring grazing area + New autumn grazing area |
1 |
- |
8 |
| New spring grazing area + Old autumn grazing area |
7.4 |
2.9 – 19.3 |
156 |
Lindqvist et al. Acta Veterinaria Scandinavica 2001 42:377 doi:10.1186/1751-0147-42-377 |
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