Lighting management in commercial poultry production significantly affects broiler and layer hen welfare through effects on behavior, health, and circadian rhythm.
Lighting management in poultry production has profound welfare implications that extend beyond simple day length. Continuous or near-continuous light disrupts the fundamental circadian biology of chickens, interfering with sleep, hormone cycles, and normal behavioral rhythms. The welfare improvements available through appropriate lighting management - defined dark periods, gradual transitions, appropriate intensity, and natural light access where possible - are well evidenced and increasingly incorporated into welfare standards. The transition from production-optimized lighting to welfare-conscious lighting programs is underway in progressive operations and represents an achievable improvement within current production systems.