Environmental enrichment for pigs is legally required in the EU and UK but the quality of provision varies enormously. Evidence-based enrichment specification maximises welfare benefit and goes beyond token compliance.
The gap between legal enrichment requirements and genuine welfare benefit is a central issue in commercial pig farming. The law requires manipulable material, but hanging chains, rubber tubing, and plastic balls meet the legal minimum while providing minimal welfare benefit. Pigs investigate novel items briefly and then ignore them; without substrate that can be rooted and consumed (or destroyed), the primary foraging motivation remains unsatisfied. The gold standard - deep straw bedding - satisfies rooting, nesting, thermally insulating, and social play needs simultaneously, but requires infrastructure incompatible with the slurry handling systems used in most large commercial units. Practical intermediate options include daily straw rations via chutes, compressed straw blocks, peat or compost for rooting, and rope or hessian materials that can be manipulated and consumed. Evidence consistently shows these options outperform conventional hanging toys on behavioural welfare indicators.