The science of pig enrichment has advanced considerably, moving from simple provision toward understanding which enrichments most effectively meet pig behavioral needs and produce welfare improvement.
Pig enrichment science has moved from the simplistic provision of any object toward evidence-based understanding of what actually improves pig welfare. The critical insight is that pigs are motivated to perform specific behaviors — rooting, chewing, investigating novel materials — and enrichments that enable these behaviors are welfare-positive, while fixed objects that cannot be manipulated are largely ineffective. Novelty drives continued engagement — the same straw that fascinates pigs on day one is largely ignored by day five. Enrichment management therefore requires rotation schedules and material variety to maintain behavioral engagement. The gap between regulatory compliance — providing any enrichment — and actual welfare improvement — providing effective enrichment managed for novelty — represents the frontier where advocacy and farm management practice must focus.