Environmental complexity in pig housing that allows multiple behavioral options significantly improves welfare through autonomy and behavioral satisfaction.
Behavioral diversity is itself a welfare indicator, reflecting the animal's ability to choose between options and express species-typical behaviors. Pigs in environments that offer thermal gradients, rooting substrates, social choices, and resting options show the kind of behavioral repertoire that indicates positive welfare states. Simple enrichment items fail to provide this complexity. Well-designed housing that incorporates multiple zones and resources creates genuine behavioral satisfaction.