The freedom to express normal natural behaviour is a core component of the Five Freedoms framework and a fundamental measure of farm animal welfare that intensive systems frequently fail.
The freedom to express normal behaviour is not a luxury additional to physical health provision but a core component of good welfare that affects both psychological and physical health. Frustrated behaviours - the inability to root, dustbathe or graze despite strong motivational drives - cause chronic frustration that is measurable in stress hormones and results in misdirected behaviours including aggression toward pen mates. The gap between what consumers believe farm animals can do and what they actually experience in standard systems is enormous. Higher-welfare systems that provide access to natural behaviour environments produce animals with measurably better health outcomes as well as positive welfare states.