Hen Perch Access and Welfare in Laying Systems

Perches are a fundamental behavioural need for laying hens, enabling roosting, thermal comfort, and the expression of natural resting behaviour.

Key Facts

Wild jungle fowl and their laying hen descendants spend the night roosting elevated above the ground
Perch use by laying hens begins in the first weeks of life — preference for height is innate, not learned
Hens without perch access show higher rates of floor eggs, feather pecking, and increased stress hormones
EU regulations require 15 cm of perch space per hen in enriched colony cages — a minimum standard
Perch design matters: round wooden perches of 3-4 cm diameter are preferred by hens over plastic or thin metal
Hens using perches at night show better keel bone condition — less fracture — than floor-roosting hens in some studies
Aviary systems that provide multi-level perching allow hens to roost at heights matching their natural preference
Perch height above 45 cm significantly reduces floor fouling and improves air quality in laying hen houses

Welfare Considerations

Perch access is not a luxury for laying hens — it is a fundamental expression of a deeply-wired behavioural drive. Hens motivated to roost but denied elevated perches show signs of chronic frustration and increased fearfulness. The relationship between perch use and keel bone health is complex: properly positioned perches used correctly reduce the jumping-related fracture risk that contributes to keel bone injury in aviary systems. Perch design and positioning are welfare details that matter: too thin, too smooth, too high, or too few perches all reduce uptake and welfare benefit. Certification schemes that specify perch dimensions, height range, and minimum linear space per bird deliver better welfare outcomes than schemes that simply require perches to be present.

What You Can Do

Choose eggs from producers certified to standards specifying perch dimensions and minimum space
Advocate for perch design standards (not just presence) in laying hen welfare regulations
Support research into optimal perch design for keel bone fracture reduction in aviary systems
Ask your egg producer what perch type, dimensions, and stocking rate their hens experience
Fund producer education on perch positioning to reduce keel bone injury from improper installation
Push for enriched colony cage phase-out in favour of perch-inclusive aviary systems