Feather pecking by laying hens causes injury, stress, and mortality in affected flocks, and understanding its causes reveals a welfare problem rooted in environmental and management deficiencies rather than inherent aggression.
Severe feather pecking represents a dual welfare problem: the pecked hen suffers pain from feather loss and wound injury, while the pecking behavior itself reflects welfare inadequacy in the flock environment. Research has consistently identified the triggers: insufficient light dimming, lack of litter or foraging substrate, excessive stocking density, nutritional deficiencies, and high mortality events that disrupt flock stability. The environmental solution to feather pecking — providing adequate foraging substrate, appropriate light intensity, stable flock composition, and sufficient space — simultaneously prevents beak trimming injuries in the peckers. Farms that address root causes rather than applying beak trimming as a management shortcut achieve welfare benefits for all birds in the system. The availability of low-pecking genetics further strengthens the case for environment-based solutions.