Poultry Lighting Welfare: Photoperiod and Bird Health

Lighting management in poultry facilities directly affects bird welfare through its impact on circadian rhythms, growth rates, behavior, and health outcomes.

Key Facts

Continuous light in broiler facilities suppresses sleep and natural behavioral rhythms, causing chronic stress
Minimum dark periods of 6 hours per day are recommended for broiler welfare and are required in some EU countries
Natural spectrum lighting with UV components enables normal foraging behavior and plumage condition in hens
Dim lighting used to suppress aggression also suppresses positive social behaviors and activity
Light intensity affects fearfulness, with very low intensity increasing stress responses in chickens
LED lighting systems can be programmed to provide species-appropriate photoperiods economically

Welfare Considerations

Lighting management is a low-cost, high-impact welfare intervention in poultry production. Providing adequate dark periods, appropriate light intensity, and full-spectrum lighting restores normal circadian function, supports natural behavior, and reduces stress in broilers and laying hens alike. The chronic sleep deprivation caused by continuous or near-continuous lighting in commercial systems is a significant and underappreciated welfare harm. Regulatory requirements for minimum dark periods and light quality standards are straightforward to implement and enforce.

What You Can Do

Support poultry welfare certification schemes that specify lighting standards including dark periods
Advocate for mandatory minimum dark period requirements in poultry facility regulations
If raising backyard poultry, provide natural photoperiods matched to season rather than continuous artificial light
Ask poultry producers and retailers about lighting standards in their supply chains