Nesting Behavior in Laying Hens and Welfare

Egg-laying is one of the most highly motivated behaviors in hens, and the frustration caused by inadequate or absent nest boxes represents a significant and common welfare failure in commercial systems.

Key Facts

Hens show pre-laying behavioral sequences including nest seeking and calling that are frustrated in cageless systems without nests
Hens will work hard to access a nest box even when able to lay on a flat surface, demonstrating strong motivation
Feather pecking and stereotypies increase in hens denied appropriate nesting opportunities
EU regulations require one nest space per 7 hens in cage-free systems
Group nests are less effective than individual nests but represent a practical compromise in large flocks

Welfare Considerations

Nesting behavior in hens is a classic example of a highly motivated behavior whose frustration causes welfare harm measurable by behavioral indicators of suffering. The pre-laying sequence — seeking a sheltered, enclosed space, calling, settling and laying — is driven by hormonal changes and serves biological functions beyond just egg deposition. Hens that cannot find appropriate nesting sites show behavioral distress, attempt to delay laying (causing physiological discomfort), and sometimes lay floor eggs, which have worse welfare outcomes. Providing adequate nest boxes is among the most impactful single housing improvements available in commercial poultry systems.

What You Can Do

Choose eggs from farms providing individual or group nest boxes with appropriate space
Advocate for nest box requirements to be enforced and regularly inspected in welfare audits
Support welfare research into optimal nest box design for different commercial flock sizes
Learn about nesting behavior as a welfare indicator when evaluating commercial egg production claims