Laying Hen Keel Bone Fracture Welfare

Keel bone fractures are one of the most prevalent and underrecognized welfare problems in commercial laying hens.

Key Facts

Studies find keel bone fractures in 50-80% of commercial laying hens across housing systems including cage-free
Keel bone fractures cause chronic pain and are associated with behavioral changes indicating discomfort
Fractures result from collisions with perches and equipment combined with bone density reduction from calcium demands
Cage-free systems paradoxically show higher keel fracture rates than some enriched cage systems due to perch collisions
Breed selection for bone density and perch design modifications can significantly reduce fracture prevalence

Welfare Considerations

Keel bone fractures represent a hidden epidemic of chronic pain in laying hens that affects welfare across all commercial housing systems. Unlike the visible confinement of battery cages, keel fractures cause invisible, ongoing suffering. The prevalence of this problem — affecting the majority of hens in many flocks — demands urgent attention. Breed selection, perch design, and calcium nutrition are all levers for meaningful improvement.

What You Can Do

Support welfare certification schemes that include keel bone fracture monitoring as an outcome measure
Advocate for keel fracture prevalence reporting as a mandatory welfare indicator
Support research into perch design modifications and breed selection reducing fracture rates
Choose eggs from producers actively monitoring and addressing keel bone fracture prevalence
Reduce egg consumption to decrease demand from systems with high keel fracture prevalence