|
Occurrence of diseases (divided into main categories) in laying hen flocks submitted to SVA in 2001–2004. |
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| Bacterial diseases |
Viral |
diseases |
Parasitic diseases |
Cannibalism |
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|
|
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| Housing system |
Total no. of flocks1 |
N |
% |
N |
% |
N |
% |
N |
% |
| Cages2 |
20 |
13 |
65.0 |
6 |
30.0 |
2 |
10.0 |
1 |
5.0 |
| Litter-based systems3 |
129 |
94 |
72.9 |
15 |
11.6 |
23 |
17.8 |
24 |
18.6 |
| Free range4 |
23 |
17 |
73.9 |
1 |
4.4 |
5 |
21.7 |
6 |
26.1 |
|
1No. of examined flocks. Note that each flock may have several diagnoses. 2Includes conventional battery cages and enriched cages. 3Includes single-tiered floor systems and multi-tiered aviary systems. 4Flocks housed in litter-based systems indoors, with access to outdoor pens and pasture, including organic flocks. | |||||||||
Fossum et al. Acta Veterinaria Scandinavica 2009 51:3 doi:10.1186/1751-0147-51-3 |
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