The science of pig enrichment has advanced substantially, moving from vague requirements for 'manipulable material' to specific evidence-based specifications for effective enrichment provision.
Pig enrichment specification science has transformed the evidence base for what constitutes effective enrichment versus token compliance. The research is clear: loose, manipulable organic materials like straw are dramatically more effective at satisfying foraging motivation than fixed objects like hanging chains. Providing straw or compost in sufficient quantity to allow actual rooting, rather than a single chain as a substitute, represents a significant welfare improvement achievable by most indoor pig producers with modest investment. Enrichment effectiveness monitoring - assessing whether pigs are actually using enrichment and whether behavioral indicators of positive welfare are present - provides the welfare-relevant feedback that input compliance checking cannot.