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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.