Laying Hen Bone Health: Preventing Osteoporosis in Production Systems

Bone fractures are one of the most prevalent welfare problems in commercial laying hens. Understanding the causes and prevention of osteoporosis helps improve welfare across production systems.

Key Facts

Over 50% of end-of-lay hens in some conventional systems have fractured keel bones
Medullary bone formation for eggshell calcium production depletes structural bone mineral throughout laying
Hens in enriched colony cages have fewer fractures than conventional battery cages but more than free-range
Exercise significantly improves bone density - hens with access to perches and range have stronger bones
Breed selection for high egg production intensifies calcium demands and bone depletion
Pain from keel fractures causes altered posture and reduced willingness to move to perches or range
End-of-lay transport and catching cause additional fractures in already-compromised bones

Welfare Considerations

Bone fractures in laying hens represent one of the largest-scale welfare problems in animal agriculture. A fractured keel bone causes chronic pain that alters behaviour and reduces welfare quality for extended periods. The prevalence of fractures in conventional systems - affecting the majority of hens - means that bone health compromise is not an individual exception but a systemic production outcome. Increasing exercise opportunities through higher welfare systems and selecting breeds with better bone density are the most effective interventions.

What You Can Do

Choose eggs from free-range or enriched systems with documented lower fracture prevalence
Support research into laying hen breed selection for improved bone density
Advocate for keel fracture monitoring as a standard welfare outcome measure in egg production auditing
Reduce egg consumption to lower demand for intensive production systems with the highest fracture rates