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Table 1 Percentage of commercial laying hens in different housing systems in Sweden in 2001–20041. The total number of hens varied between 5,042 to 5,904 million birds per year.

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

Year/Housing system

2001

2002

2003

2004

2001–2004

Conventional battery cages

66.5

52.3

26.0

13.5

38.6

Furnished cages

7.5

12.6

24.2

24.8

17.6

Litter-based systems 2

22.6

31.2

43.8

55.0

38.7

Free range 3

3.4

3.9

6.0

6.7

5.1

Total

100

100

100

100

100

  1. 1The table is based on data collected in May to August each year [5].
  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.