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Table 3 Occurrence of diseases (divided into main categories) in laying hen flocks submitted to SVA in 2001–2004.

From: Causes of mortality in laying hens in different housing systems in 2001 to 2004

  

Bacterial diseases

Viral

diseases

Parasitic diseases

Cannibalism

Housing system

Total no. of flocks 1

N

%

N

%

N

%

N

%

Cages 2

20

13

65.0

6

30.0

2

10.0

1

5.0

Litter-based systems 3

129

94

72.9

15

11.6

23

17.8

24

18.6

Free range 4

23

17

73.9

1

4.4

5

21.7

6

26.1

  1. 1No. of examined flocks. Note that each flock may have several diagnoses.
  2. 2Includes conventional battery cages and enriched cages.
  3. 3Includes single-tiered floor systems and multi-tiered aviary systems.
  4. 4Flocks housed in litter-based systems indoors, with access to outdoor pens and pasture, including organic flocks.