Pig Enrichment in Practice: What Research Tells Us Works

Enrichment for pigs reduces aggression and stereotypies, but not all enrichments are equal. Evidence on what works best guides practical implementation.

Key Facts

EU regulations require "permanent access to manipulable material" for pigs, but compliance and material quality vary enormously.
Rooting substrates (straw, peat, compost) provide the most sustained and valued enrichment for pigs due to their strong rooting drive.
Hanging chains — the most common form of enrichment in slatted systems — have limited benefit because pigs habituate quickly.
Novel enrichment maintains interest better than static objects; rotating materials weekly restores engagement.
Edible enrichment (brassicas, root vegetables, hay) provides both nutritional and behavioural benefits.
Paper and cardboard, though not traditional enrichment, are valued by pigs for manipulation and nest-building behaviour.
Studies comparing enrichment types consistently show rooting substrate outperforming all other forms.
Enrichment is most effective when introduced early: piglets given enrichment from birth maintain interest and show better welfare indicators throughout the production cycle.

Welfare Considerations

Enrichment research for pigs has produced a clear hierarchy of effectiveness: rooting substrates are substantially superior to all other enrichment types, yet are the least commonly provided in commercial systems because they are incompatible with slatted floor management. This creates a practical tension: the enrichment that pigs value most conflicts with the housing system used most widely. Addressing this requires either changing housing (to solid or partially solid floors with substrate) or finding workable substrate delivery systems for slatted environments (e.g., substrate racks or enrichment blocks containing rooting material). The evidence base for pig enrichment is robust and practical, enabling evidence-based welfare standards rather than token compliance with vague "manipulable material" requirements.

What You Can Do

Support welfare certification schemes that require rooting substrate rather than merely "manipulable material".
Choose pork from systems that provide genuine rooting enrichment.
Advocate for legislative strengthening of enrichment requirements with specific material standards.
Support research into workable rooting substrate delivery for slatted floor housing systems.
Encourage pig farmers to trial rooting substrate delivery systems and share results.
Raise awareness that hanging chains do not constitute meaningful enrichment for pigs.