Enriched colony cages, while banning the old barren battery cage, have been criticised as providing insufficient welfare improvement. Understanding enriched colony welfare relative to alternative systems informs consumer choice.
Enriched colony cages represent a welfare improvement over conventional battery cages but fall substantially short of providing conditions that allow normal hen behaviour. The welfare gains - some space for movement, a nest box for laying, substrate for pecking - address some but not all natural behavioural needs. Perch access in enriched colonies is often competitive, with subordinate hens unable to access perches regularly. The keel bone fracture rate, while partly related to perch design, reflects both space constraints and management limitations. The most significant welfare limitation of enriched colonies versus barn and free-range systems is the complete absence of outdoor access: sunbathing, dust bathing in proper soil substrate, and expressing the full natural behavioural repertoire requires outdoor access that enriched colonies cannot provide.