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Table 2 Numbers and percentage of commercial laying hen flocks submitted for necropsy to SVA and included in the study.

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

 

2001

2002

2003

2004

Housing systems

N

%

N

%

N

%

N

%

Cages 1

5

41.7

6

9.1

4

9.5

5

9.6

Litter-based systems 2

5

41.7

54

81.8

32

76.2

38

73.1

Free range 3

2

16.6

6

9.1

6

14.3

9

17.3

Total

12

100

66

100

42

100

52

100

  1. 1Includes conventional battery cages and enriched cages.
  2. 2Includes single-tiered floor systems and multi-tiered aviary systems.
  3. 3Flocks housed in litter-based systems indoors, with access to outdoor pens and pasture, including organic flocks.