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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.