Johne’s Control Starts With Good Management
Posted on November 13, 2012 in Starting Strong - Calf Care
By Augusta Hagen, dairy nutrition and management fellow
Johne’s is caused by Mycobacterium paratuberculosis and is a slow and untreatable disease. It typically infects calves, but animals show no clinical signs of the bacterial disease until they reach three or more years of age.
The Johne’s bacteria can survive in soil or water for more than a year, but will only replicate inside a host animal. Animals are most susceptible in the first six months of life. The initial infection occurs most commonly at birth through ingestion of fecal material, including feces present in contaminated colostrum or milk.
According to Collins, clinical symptoms of Johne’s include “persistent or intermittent diarrhea and weight loss that is non-responsive to treatment.” A costly disease, Johne’s can often be an “invisible” issue on your farm. That’s because a majority of the herd can be infected with the disease – and spread it to other animals – while only a few exhibit clinical symptoms. That’s why it’s important to set testing and prevention protocols.
Collins suggests the first and most important way to prevent Johne’s disease is follow best management practices for calf rearing. These include:
- Writing standard operating procedures that everyone on the farm can read and follow for the maternity pens and calf rearing
- Placing the maternity pens apart from the sick cow pens
- Separating Johne’s-positive and negative cows when calving
- Removing the calf from the cow within one hour of calving
- Administering 4 quarts of colostrum collected from a Johne’s-free cow or colostrum replacer in a timely manner
- Practicing good sanitization for feeding and watering heifers
Another method of prevention is using a Johne’s vaccination. Discuss vaccination strategies with your local veterinarian.
If your herd is infected, getting rid of Johne’s will probably not be a simple task. In fact, it could take up to five years to economically clean up a Johne’s herd.
Collins suggests that each farm have a Johne’s disease testing program. Ideally, all cows should be ELISA blood-tested at the end of the lactation. Cows labeled positive should be calved in separate maternity pens and colostrum should be tested and labeled. For cows classified as “strong positive” by the ELISA test, culling before calving may be the best option as these cows aren’t likely to survive the lactation.
Collins also reminds producers that testing and control protocols shouldn’t replace good farm management and sanitation practices. Discuss all testing, vaccination and control protocols with your veterinarian.
- Collins, Mike. “Biosecurity on Dairies. Are we doing enough?” Vita Plus Dairy Summit 2002 Conference Proceedings.