Zero-grazing systems keep cattle permanently indoors, eliminating access to pasture. Understanding the welfare trade-offs of confinement versus outdoor access informs evaluation of dairy production systems.
Zero-grazing represents a welfare trade-off between precise production management and behavioral freedom. Cattle in permanent confinement are deprived of one of their most natural and health-beneficial activities — grazing on diverse pasture. They cannot engage in the movement, social spread, and exploratory behavior that outdoor access provides. Lameness rates are higher on hard indoor flooring. Play behavior — a reliable welfare indicator — occurs far more frequently in cattle with outdoor access. Conversely, outdoor systems create their own welfare challenges in extreme weather. The evidence balance generally favors systems with meaningful pasture access.