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 |