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What is Bovine TB?

Bovine Tuberculosis

Bovine Tuberculosis is a chronic, highly infectious disease of cattle caused by Mycobacterium bovis. The bacterium can cause disease in other domestic or wild animals and also in humans.

Causes of infection in cattle

  • Breathing air contaminated by already infected animals;
  • Consuming contaminated food or water;
  • Movement of animals and contact with infected animals e.g. across fences;
  • Inter-farm sharing of machinery (cattle trailers, muck/slurry spreaders, etc.) or farm facilities (cattle crushes);
  • The use of dirty lorries to transport animals;
  • Wildlife, especially badgers, infected with Mycobacterium Bovis may be a significant factor in the persistence of bovine tuberculosis in certain areas.

Precautions against TB Infection

  • Have stock-proof boundary fencing;
  • Avoid contact with other herds and stock of unknown status;
  • Exercise care in buying-in cattle. Ensure that only recently tested cattle are allowed onto your farm to mix with your stock;
  • Avoid using dirty contract equipment e.g. cattle transport, slurry spreaders. All such equipment should be cleansed and disinfected before use.

The risk of spread from wildlife can be reduced by keeping cattle and infected wildlife apart and by implementing the following measures:

  • Fencing off common watercourses, stagnant ponds, badger setts and badger toilet areas;
  • Raising drinking and feeding troughs to over 84 cm (32 inches) in height and locating them away from walls/ditches to prevent access;
  • Not providing hand feeding to cattle where deer can share it e.g. circular feeders and/or meal troughs;
  • Keeping feed storage areas, cattle sheds and yards closed so that wildlife cannot gain entry;
  • Checking fields regularly for badger carcasses and especially before moving cattle onto new pasture - note that manual blocks kept in fields may also be accessed by badgers;
  • Being aware of unusual sightings of badgers e.g. in daytime. The badgers may be sick from TB - contact your District Veterinary Office.

The ideal long-term answer to the problem of bovine tuberculosis is eradication. With an appropriate co-ordinated approach, together with new technology currently being developed, Ireland can advance towards eradication of Bovine TB.

Testing Arrangements

Annual "Round" screening test

  • It is a legal requirement that cattle over 6 weeks of age have had a TB test within the previous 12 months before moving out of a holding. Therefore all herds must be tested at least once every 12 months. The Department issues schedules of herd tests to private veterinary practitioners in phases throughout the year. Farmers, under cost-sharing agreements, pay the private veterinary practitioners directly to carry out one test per annum. Reminders are sent out as appropriate to ensure testing is carried out on theprescribed dates. Where necessary, holdings are restricted for-non-compliance with the instruction to test under the Round test regime.

Export pre-movement test

  • There is a mandatory 30-day pre-movement TB test on animals exported,

Consequential testing

  • Other tests for TB include reactor re-test, factory lesion re-test, post de-restriction (status-restoration) test, contiguous test, new herd tests.