LIVESTOCK AND CAMELIDS · OWNER EDUCATION
Johne's Disease in Ruminants
Johne's disease is a chronic contagious intestinal infection that causes progressive weight loss and production decline.
THE SHORT VERSION
Understanding supports better veterinary conversations.
Johne's disease is a chronic contagious intestinal infection that causes progressive weight loss and production decline. The same outward signs can occur with several diseases, so an examination and appropriately selected testing are important.
What is this condition?
Johne's disease is a chronic contagious intestinal infection that causes progressive weight loss and production decline. The same outward signs can occur with several diseases, so an examination and appropriately selected testing are important.
Which animals can be affected?
Risk factors, examination findings and management can differ between species and individual patients.
Why can it happen?
- Mycobacterium avium subspecies paratuberculosis spread mainly through contaminated manure, milk or environments.
- Animals are often infected young but may not show signs for years.
What might an owner notice?
- Progressive weight loss despite appetite.
- Chronic diarrhea is common in cattle; sheep, goats and camelids may lose weight without obvious diarrhea.
How is the problem investigated?
- Fecal polymerase chain reaction or culture and blood testing interpreted at herd level.
- Repeated testing may be needed because early infection can be difficult to detect.
What might treatment involve?
- No practical curative herd treatment; management focuses on biosecurity and limiting transmission.
- Work with the herd veterinarian on testing, culling and young-stock protection.
This is an overview, not a prescription or a recommendation for a specific individual animal.
What can owners do at home?
- Write down when the problem began and track appetite, drinking, waste, activity, breathing and medication use.
- Bring clear photos or short videos when they can be taken without stressing the animal.
- Follow the veterinary team's instructions for medication, feeding, isolation, environmental changes and rechecks.
Avoid actions that could make care less safe.
- Do not use human medication, leftover antibiotics or another animal's treatment without veterinary direction.
- Do not force food or water into an animal that cannot swallow normally, is struggling to breathe or may have an obstruction.
- Do not delay veterinary care when pain, breathing, appetite, urination, movement or responsiveness changes quickly.
What can the longer-term outlook involve?
The outlook depends on the underlying cause, severity, species and how quickly effective care begins.
Can risk be reduced?
- Provide species-appropriate nutrition, housing, sanitation and routine veterinary care.
- Learn the animal's normal behavior, appetite, body condition and waste pattern so meaningful changes are noticed early.
When should you arrange care?
- Contact a veterinarian promptly for progressive weight loss despite appetite. or chronic diarrhea is common in cattle; sheep, goats and camelids may lose weight without obvious diarrhea..
- Arrange reassessment if signs return, worsen or do not improve as expected.
Seek emergency veterinary care if you notice:
SEEK EMERGENCY VETERINARY CARE- Severe dehydration, inability to stand or rapid decline requiring immediate welfare assessment.
Sources behind this guide
VeterinaryPartner — client education from the Veterinary Information NetworkPrimary veterinary or veterinary-university guidance ↗Merck Veterinary Manual: livestock healthPrimary veterinary or veterinary-university guidance ↗Content last reviewed: September 17, 2026. Review status: veterinary-informed; independent veterinarian review not yet completed.