Modern dairy cows have been selectively bred for extreme milk yields that impose severe physiological burdens. Understanding the welfare implications of high-yield dairy production is essential for reform.
High-yield dairy production creates a fundamental welfare tension: the genetic selection that maximises milk production simultaneously undermines physical health. The modern Holstein dairy cow's body is under extreme physiological stress from the moment calving triggers lactation. Negative energy balance — where the cow cannot eat enough to meet lactation demands — predisposes her to ketosis, displaced abomasum, and metritis. Udder size and weight cause lameness through altered gait and increased hoof loading. These are not management failures but consequences built into the genetics of commercial dairy breeds. Meaningful welfare improvement requires addressing breeding goals alongside husbandry — selecting for health and longevity, not just yield — alongside better housing, pain management, and transition period nutrition.