Scientific research on laying hen enrichment has moved beyond simply providing perches to understanding the full behavioral repertoire that hens need and how to provide it cost-effectively.
The science of laying hen enrichment has matured to provide nuanced guidance that goes beyond simply measuring cage size. Research has identified which specific behaviors are most strongly motivated — nesting and perching are particularly high priorities because their deprivation causes acute, measurable distress — and how environmental design affects behavior expression in different housing systems. The transition away from conventional battery cages, now complete in the EU and underway in many US states, has been driven substantially by this welfare science. However, the next frontier is optimizing welfare within cage-free systems, which are not uniformly welfare-positive: large commercial cage-free barns can have significant problems with pecking, disease, and resource competition if not carefully managed. Litter management, adequate feeder space, perch availability and design, and flock size all affect welfare outcomes in cage-free systems. Welfare certification schemes that specify these parameters, not just housing type, provide more reliable welfare assurance.