Dust bathing is one of the most strongly motivated behaviours in laying hens. Its frustration in conventional housing systems is a clear and measurable welfare harm that drives calls for enriched environments.
Dust bathing is among the most scientifically compelling examples of behavioural deprivation in farm animal welfare. The persistence of vacuum bathing — performing the movements on a wire floor with no substrate — demonstrates that the motivation cannot be suppressed, only frustrated. This is not a preference; it is a need. Welfare-focused housing systems treat dust bathing provision as a minimum standard, not an optional enrichment. The welfare science here is unusually clear and the practical solution is straightforward: provide appropriate substrate.