Laying Hen Perches: A Simple but Critical Welfare Resource

Perches are a fundamental welfare resource for laying hens, enabling natural roosting behaviour, reducing bone fracture risk, and supporting the expression of species-typical resting patterns that are denied in cage systems.

Key Facts

Jungle fowl — the ancestors of domestic chickens — roosted in trees at night to avoid predators, a behaviour so deeply ingrained it is expressed by every domestic hen given the opportunity
Hens in cage systems without perch access show significantly higher rates of osteoporosis than those with perches — perch use stimulates bone mineralisation through weight-bearing exercise
Keel bone fractures affect an estimated 50-80% of laying hens in cage-free systems without adequate perch design — often caused by jumping from poorly positioned perches
Perch height, diameter, material, and spacing all affect welfare outcomes — research has identified optimal designs that reduce keel bone fracture risk
Hens show strong preference for roosting at height — ground-level resting alternatives do not substitute for elevated perch access at night
Colony cages enriched with perches show better bone mineralisation than bare cages but still restrict the full expression of roosting behaviour
The EU ban on conventional battery cages in 2012 mandated perch provision in enriched colony cages as a minimum welfare requirement

Welfare Considerations

The perch is not a luxury for hens — it is a fundamental biological need. A hen without perch access at night is denied one of the most strongly motivated behaviours in her repertoire, forced to rest on the ground in a posture that offers neither the bone-loading benefit of perch use nor the security that elevation provides. The keel bone fracture epidemic in cage-free systems represents an unintended welfare consequence of systems designed to improve on battery cages but that have not yet optimised perch design for fracture prevention. This is a solvable problem — research has identified perch characteristics that dramatically reduce fracture rates — but implementation requires industry commitment to invest beyond minimum legal requirements.

What You Can Do

Choose eggs from farms that demonstrate high-welfare perch provision including elevated roosting access at appropriate height
Advocate for regulatory standards that specify evidence-based perch design requirements beyond simple provision mandates
Support research into keel bone fracture prevention through optimal perch design in cage-free systems
Ask egg producers and retailers about their perch specifications and keel bone fracture monitoring practices
Share information about keel bone welfare in laying hens — it is a significant but underappreciated issue in the cage-free transition
Support farm assurance schemes that monitor and report keel bone fracture prevalence as a welfare outcome measure