Dust bathing is a deeply motivated natural behavior in chickens that serves essential functions in feather maintenance and parasite control. Denying chickens the opportunity to dust bathe causes measurable frustration and welfare harm.
Dust bathing is not optional behavior for hens — it is driven by a highly motivated internal drive that builds up across hours of deprivation and is released intensely when substrate becomes available. The rebound effect demonstrates that deprivation causes a welfare deficit that accumulates over time. Battery cage systems, and to a lesser extent enriched cages, systematically deny this need to billions of hens globally. Free-range and barn systems with adequate litter allow normal dust bathing but management of litter quality is critical. Deep litter that remains dustable throughout a flock cycle is a meaningful welfare indicator.