Research into effective pig enrichment has identified specific substrates and objects that most reliably improve welfare in intensive systems.
Pig enrichment science has moved beyond simply providing any novel object. Evidence shows rooting substrates that allow destructive investigation are most effective at reducing tail biting and improving welfare indicators. Multiple enrichment types providing different behavioral outlets simultaneously are more effective than single objects. Regular rotation maintains engagement. Application of enrichment science principles is the most cost-effective welfare improvement available.