Rotating enrichment materials regularly maintains their welfare value for pigs, as habituation reduces behavioral engagement with familiar objects within hours of introduction.
Providing enrichment to pigs is only beneficial if the enrichment maintains motivational salience — pigs must actually interact with it. Habituation to fixed objects means that a chain hanging in the corner of a pen provides diminishing welfare benefit as pigs cease engaging with it. Rotation of different enrichment types including straw, hanging ropes, root vegetables, and novel objects maintains novelty and the exploration motivation that drives welfare benefits. Enrichment programs designed with rotation built in are substantially more effective than static provision.