Mastitis is the most common and costly disease in dairy cattle, causing significant pain and suffering that well-managed prevention programs can dramatically reduce.
Mastitis causes acute and chronic pain that significantly reduces dairy cow welfare. Clinical cases involve visible swelling and heat in affected quarters with behavioral changes including reduced movement, lameness-like gait, and reduced feed intake from systemic illness. The pain of acute mastitis during milking — when already inflamed tissue is subjected to mechanical suction — causes measurable aversion responses. Subclinical mastitis, while invisible, causes ongoing immune activation and discomfort. The welfare impact extends beyond the disease episode: cows that develop chronic mastitis face repeated antibiotic treatment, progressive tissue damage, and ultimately early culling — removing years of potential productive and comfortable life.