Animal welfare auditing systems vary widely in rigor and reliability, with animal-based measures providing more meaningful welfare assessment than resource-based checks.
Welfare auditing is only valuable if it accurately reflects animal welfare rather than compliance with input requirements that may not achieve welfare. An audit that checks box dimensions but not bird behavior misses the welfare reality. Animal-based measures that assess the animal's actual state are more valid indicators. The gap between audit results and actual welfare outcomes is a known problem requiring systemic reform toward outcome-focused assessment.