Farm Animal Welfare

Laying Hen Bone Health Nutrition

Laying hen bone health is undermined by continuous calcium depletion for eggshell production. Nutritional interventions can substantially reduce fracture risk.

Key Facts

Laying hens lose 30-35% of their bone mass during the laying year as calcium is mobilized for eggshell
Keel bone fractures affect 50-80% of hens in most housing systems at end of lay
Calcium provision timing matched to peak eggshell synthesis improves calcium absorption efficiency
Vitamin D3 in active form (25-OHD3) improves bone calcium mobilization and reduces fracture risk
Reducing production through shorter lighting programs reduces cumulative bone stress at welfare cost

Welfare Considerations

Laying hen bone health represents a welfare problem embedded in the genetics and management of intensive egg production. Continuous egg production at commercial rates depletes bone calcium at rates the skeleton cannot sustain without fracture. Nutritional optimization can reduce but not eliminate this welfare burden - ultimately breed reform and reduced production intensity address root causes.

What You Can Do

Support egg certification schemes requiring keel bone fracture monitoring and nutrition protocols
Choose eggs from systems with documented bone health welfare programs
Advocate for mandatory keel bone fracture monitoring as a welfare indicator in egg production regulation
Support research into nutritional and genetic approaches to laying hen bone health improvement