Dust bathing is a fundamental behavioral need for all domestic chickens that is completely prevented in cage and many cage-free systems, causing chronic frustration.
Dust bathing frustration is a welfare problem that permeates conventional chicken production regardless of whether birds are in cages or cage-free barns without adequate substrate. The behavior is highly motivated: hens deprived of substrate perform vacuum dust bathing — going through the motions on bare wire — demonstrating the strength of this behavioral drive even when it cannot be fulfilled. Appropriate deep litter that allows complete dust bathing sequences is both a welfare requirement and a practical achievable goal for producers committed to genuine welfare improvement beyond the cage-free label alone.