EU regulations requiring enrichment for farmed pigs have driven research into what materials actually meet pigs behavioral needs versus what constitutes a minimal compliance gesture.
The enrichment requirement for farmed pigs represents a case study in the gap between regulatory intent and practical outcome. The EU regulation was designed to ensure pigs can express natural investigative and rooting behaviors that are intrinsically motivated and welfare-relevant. In practice, the most common compliance response — a hanging chain — occupies pigs only briefly and does not address the underlying behavioral drive to manipulate rooting substrate. The consequence is continued tail biting, frustration stereotypies, and welfare deficits that the regulation was designed to prevent. The evidence is clear on what works: organic, manipulable substrate that can be rooted, chewed, and spread. Implementation requires infrastructure changes in slatted floor systems, but these changes are achievable and are standard in higher-welfare pig production systems in countries like Denmark and the Netherlands.