Mastitis Prevention and Cow Welfare in Dairy

Mastitis is the most costly and welfare-significant disease in dairy cattle, with prevention through hygiene, genetics, and dry cow management representing major welfare and economic priorities.

Key Facts

Mastitis costs the global dairy industry billions annually making it the most economically significant dairy disease
Clinical mastitis causes painful udder inflammation with the quarter becoming hot, swollen, and producing abnormal milk
Subclinical mastitis with elevated somatic cell count but no visible signs represents chronic low-grade inflammation
Environmental mastitis from Streptococcus uberis and E. coli is associated with contaminated bedding and poor hygiene
Contagious mastitis from Staphylococcus aureus spreads through milking equipment and milker hands
Genetic selection for udder health traits can significantly reduce mastitis susceptibility at herd level
Selective dry cow therapy using individual cow risk assessment reduces unnecessary antibiotic use

Welfare Considerations

Mastitis causes significant pain particularly in acute clinical cases where udder inflammation causes visible distress. Cows with mastitis show altered behavior, reduced lying time, and reduced feed intake indicating systemic discomfort beyond the local infection. Chronic subclinical mastitis causes prolonged immune activation and systemic effects. Repeated mastitis episodes cause progressive udder damage and eventually culling. Prevention is both more effective and more welfare-positive than treatment. Targeting prevention resources toward high-risk animals and periods, combined with genetic selection for udder health, reduces the welfare burden of mastitis across the entire herd.

What You Can Do

Implement systematic udder hygiene protocols including pre- and post-milking teat disinfection
Use clean, dry, and frequently replenished bedding to reduce environmental mastitis pathogen exposure
Maintain and service milking equipment regularly to prevent mechanical trauma and cross-contamination
Screen all cows at dry off and calving for mastitis risk to guide selective dry cow therapy
Include udder health traits in breeding goals to reduce genetic predisposition at herd level
Treat clinical mastitis promptly and monitor for treatment failure requiring veterinary input
Set somatic cell count targets and monitor trends to track mastitis prevention program effectiveness