Laying Hen Keel Bone Fractures and Welfare

Keel bone fractures affect the majority of laying hens in commercial systems and cause significant chronic pain that is widely unrecognized and inadequately addressed.

Key Facts

Keel bone fractures affect 50-80% of hens in commercial laying systems including cage-free
The keel bone supports wing muscles and flight — fractures cause pain particularly during movement
Current cage-free housing systems paradoxically have higher keel bone fracture rates than enriched cages
Breeding for high egg production may contribute to bone fragility through calcium demands
X-ray diagnosis of keel fractures requires equipment unavailable in routine farm assessment

Welfare Considerations

Keel bone fractures represent one of the most significant and least recognized welfare problems in egg production. The sheer scale — a majority of the approximately 350-400 million laying hens in the EU experiencing fractures — makes this arguably the largest source of unaddressed pain in European farm animal welfare. The fractures are painful, chronic, and largely invisible without specialized assessment. Movement, particularly flight from perches in cage-free systems, is a primary fracture mechanism. Addressing this welfare crisis requires breeding programs selecting for bone strength, housing redesign, and veterinary monitoring protocols.

What You Can Do

Support research into keel bone fracture prevention in laying hen systems
Advocate for keel bone prevalence monitoring to be required in welfare certification schemes
Choose eggs from producers with published keel bone management programs when available
Support breeding programs that select for bone health alongside production traits
Raise awareness of keel bone welfare — this is poorly known even among animal welfare advocates