Johne's Disease in Cattle: Welfare and Control

Johne's disease (paratuberculosis) causes chronic, progressive wasting in cattle and sheep, representing a significant welfare burden on affected farms.

Key Facts

Johne's disease is caused by Mycobacterium avium subsp. paratuberculosis (MAP) and affects cattle, sheep, and goats
Cattle typically become infected in the first few months of life but do not show clinical signs until 2-5 years of age
Clinical signs include profuse watery diarrhoea, progressive weight loss, bottle jaw (fluid accumulation), and eventual wasting
Affected cattle show reduced production 1-2 years before clinical signs appear — a prolonged subclinical welfare impact
There is no effective treatment — affected cattle typically deteriorate and die or are culled
Whole-herd testing followed by culling of test-positive animals is the primary control strategy
Vaccination is available in some countries and reduces clinical disease but does not eliminate infection
Colostrum management — feeding calves only from test-negative dams — is the most effective prevention in young stock

Welfare Considerations

Johne's disease welfare is insidious: the prolonged subclinical phase means animals experience declining welfare — reduced nutrient absorption, increased susceptibility to secondary infections, body condition loss — for months to years before clinical signs trigger recognition and action. By the time clinical diarrhoea and wasting are apparent, significant suffering has already occurred. The welfare priority is early detection through surveillance testing and removal of test-positive animals before they reach advanced clinical disease. Farms with active Johne's control programmes — test, cull, and hygiene management — protect the welfare of future animals by reducing herd MAP burden and preventing new infections in young stock.

What You Can Do

Support certification schemes requiring Johne's disease testing and control programmes on dairy farms
Advocate for national Johne's control programmes with producer incentives for testing participation
Choose dairy products from farms certified to high welfare standards with herd health planning requirements
Fund research into improved MAP vaccines for cost-effective Johne's prevention in cattle populations
Encourage dairy producers to adopt colostrum management protocols targeting MAP-negative dams
Donate to animal welfare organisations supporting farmer education on Johne's disease early detection