Zero-grazing dairy systems confine cattle indoors year-round, denying access to pasture. The welfare implications of grazing deprivation are significant, with evidence that cattle strongly prefer pasture access.
The welfare case for pasture access in dairy cattle rests on evidence that cattle are motivated to access pasture, express more natural behaviors when grazing, and often show better welfare indicators in pasture-based compared to zero-grazing systems. A dairy cow denied any pasture access throughout her productive life is being deprived of a highly valued behavioral opportunity - the equivalent of permanent indoor confinement for a species evolved to walk significant distances and graze selectively. This is not a minor preference deprivation but a significant behavioral restriction. Consumer interest in pasture-based dairy is growing, and schemes like Pasture Promise in the UK (certifying minimum 180 days pasture access) are creating market incentives for welfare-positive dairy production.