Laying Hen End-of-Lay Welfare and Depopulation Standards

The end of the laying cycle represents a critical welfare point where billions of hens are slaughtered annually, and the methods used for depopulation vary significantly in the welfare harm they cause.

Key Facts

Commercial laying hens are typically slaughtered at 72-78 weeks when egg production declines economically
Approximately 7-8 billion laying hens are slaughtered globally each year at end of lay
Controlled atmosphere killing using inert gas or carbon dioxide is considered more humane than live shackling
Live shackling of hens onto moving slaughter lines while conscious causes significant wing flapping and stress
Some end-of-lay hens are used for processed chicken products — their welfare during slaughter is identical to broilers
Water bath stunning failure in end-of-lay hens occurs at rates up to 40% in some audits due to smaller head size
On-farm controlled atmosphere killing avoids transport entirely — a welfare benefit for compromised older hens
Extended lay programs using lighting manipulation push hens to 100+ weeks before slaughter

Welfare Considerations

End-of-lay slaughter involves welfare harms at multiple points in a compressed timeframe. Transport of hens depleted from a year of laying is particularly welfare-risky — their bone fragility from calcium mobilization for eggshells makes fractures from rough handling common. Water bath stunning failures in end-of-lay hens are higher than in younger birds because smaller head size affects electrical contact. The scale of the welfare issue is extraordinary: seven billion individual welfare events annually, each involving capture, transport, shackling, and killing. Improvements — controlled atmosphere killing on farm, better transport standards for depleted birds, and improved stunning audit requirements — collectively affect more animal welfare units than almost any other single production practice change. Consumer and retailer pressure on egg producers to improve depopulation standards is therefore high-leverage.

What You Can Do

Choose eggs certified by schemes requiring controlled atmosphere or improved slaughter standards for end-of-lay hens
Support campaigns for mandatory controlled atmosphere killing requirements for laying hen depopulation
Advocate for transport welfare standards specifically addressing the fragility of depleted end-of-lay hens
Reduce egg consumption or shift to certified higher welfare eggs with documented end-of-lay welfare standards
Support research into extended lay programs that reduce the frequency of depopulation while maintaining hen welfare