Water access for bathing and natural behaviour is a fundamental welfare need of ducks that is denied in most commercial duck production systems, representing a significant welfare problem.
Duck welfare in commercial production illustrates how the most fundamental natural behaviours can be entirely denied in production systems optimized for efficiency. A duck that cannot bathe is a duck that cannot maintain basic physiological and hygiene functions for which its biology is specialized. The welfare cost is not marginal — it is the frustration of one of the most strongly motivated behaviours in the species' behavioural repertoire.