Cattle Mastitis and Dairy Cow Udder Health Welfare

Mastitis is the most common and costly disease in dairy cattle, causing severe udder pain and systemic illness that represents the single largest welfare problem in the dairy industry.

Key Facts

Mastitis affects approximately 40% of dairy cows in the UK each year, with some cows affected multiple times
Clinical mastitis causes udder pain, swelling, and heat, with systemic signs including fever and reduced milk production
E. coli mastitis can cause peracute toxic mastitis with collapse and death within hours
Subclinical mastitis causes no visible signs but significant welfare compromise through chronic udder inflammation
Dry cow antibiotic therapy and teat sealants prevent new mastitis infections during the non-milking period

Welfare Considerations

Mastitis causes acute suffering from udder pain and systemic toxaemia in clinical cases, and chronic discomfort from ongoing inflammation in subclinical cases. The udder of a mastitic cow is swollen, hard, and exquisitely painful to touch — milking causes intense pain that the cow signals through kicking and flinching. Peracute toxic E. coli mastitis causes rapid systemic deterioration and death without aggressive treatment. Subclinical mastitis, detectable only by somatic cell count, causes ongoing welfare compromise below the threshold of owner recognition. Herd mastitis control programmes that reduce incidence at herd level deliver welfare improvements across thousands of individual cow-days of prevented suffering annually.

What You Can Do

Implement a mastitis control programme with a veterinarian targeting milking hygiene, teat condition, and dry cow management
Treat clinical mastitis promptly with appropriate antibiotics after bacteriological sampling
Monitor somatic cell counts as a welfare indicator of udder health at herd and individual cow level
Advocate for mastitis incidence as a mandatory welfare reporting metric in dairy certification schemes