Environmental enrichment for broiler chickens — providing resources beyond the bare minimum that allow expression of natural behaviours — is increasingly recognised as essential for welfare-positive production. A substantial body of scientific research now demonstrates the effectiveness and feasibility of various enrichment approaches.
Commercial broilers are typically raised in large, bare flocks on litter with no objects to interact with, no elevated structures, and no covered areas. This environment prevents expression of natural behaviours — perching, dustbathing, foraging, and exploration — that are strongly motivated in chickens. The result is chronic under-stimulation that contributes to welfare compromise alongside the more frequently discussed issues of leg health and growth-rate related problems.
Chickens have a strong motivation to use elevated perching structures. Providing perches in broiler housing is the most studied enrichment intervention. Key findings:
Providing materials that allow scratching and foraging behaviour addresses one of chickens' most strongly motivated behaviours. Pecking blocks, grain scatter on litter, and hanging cabbage or corn cob toys all increase foraging behaviour and reduce redirected pecking behaviours. Even small amounts of scattered grain on the litter significantly increase foraging activity.
Dustbathing is a strongly motivated maintenance behaviour in chickens. Broilers perform "sham dustbathing" on bare litter, but provision of loose substrate (sand, peat) increases dustbathing quality and frequency. Dustbathing is associated with positive affective states — birds show signs of relaxation and satiation after dustbathing bouts.
Provision of areas with lower light intensity (covered areas or shade structures) within broiler housing improves welfare by allowing choice and reducing stress. Dimmable lighting schedules that provide 8 hours of darkness allow rest and reduce fear. Birds in enriched lighting environments show reduced startle responses and lower fear scores.
Cost-benefit analyses of broiler enrichment consistently show modest additional costs (perch systems: £0.01-0.05 per bird) with associated benefits including improved welfare scores, reduced mortality, and better feed conversion in some studies. Major retailer welfare specifications in the UK and EU are increasingly including enrichment requirements, driving commercial adoption beyond voluntary uptake.