Straw provision is among the most effective and widely studied enrichment for pigs. Understanding the welfare value of straw supports advocacy for its mandatory provision.
Straw provision is among the highest-impact low-cost welfare improvements available in pig production. Removing straw as inefficient or incompatible with slurry systems removes behavioral opportunity that pigs are strongly motivated to use. The behavioral frustration of being confined without manipulable material drives the serious welfare problems of tail-biting and stereotypic behavior. Mandatory straw provision with adequate quantities would represent a major welfare improvement.