Understanding mastitis as one of the most significant welfare problems in dairy cattle, covering its causes, welfare impacts, treatment ethics, and prevention strategies.
Mastitis is simultaneously the most common and one of the most significant welfare problems in dairy production. The acute clinical form is deeply painful — cows with severe mastitis show pain facial action units, reduced movement, and systemic illness that any welfare assessment must recognize as severe suffering. Yet pain management for mastitis remains inconsistent: surveys consistently find significant proportions of dairy farms failing to administer NSAIDs to clinically mastitic cows despite clear evidence that anti-inflammatory treatment reduces both suffering and treatment failure. The chronic subclinical form, while less dramatically visible, involves persistent udder inflammation that affects quality of life over months. High milk production selection creates a vicious cycle: the metabolic demands of high-yielding dairy cows impair immune function, increasing mastitis susceptibility, while the volume of milk to clear amplifies pain when the udder becomes inflamed. Long-term welfare improvement in dairy cattle requires both immediate interventions (mandatory pain relief for mastitis cases) and structural reforms (selection away from ultra-high production toward balanced health and welfare traits).