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Home » BACTERIAL DISEASES » Blackleg/Black quater

Thursday, May 9, 2013

Blackleg/Black quater

Blackleg is a fatal disease of young cattle and sheep. It affects the animal in a very severe manner. The bacterium enters the body by ingestion (through food) and then makes small punctures in the mucous membrane of the digestive tract. The microbe which causes the disease affects the muscles and then starts to spread a poison in the body. 
Blackleg is commonly known by the names of black quarter and quarter ill. 


Causative Organism
Clostridium chauvoei is the causative organism in most cases. Some affected animals have also been found to be affected with Clostridium feseri. These two microbes are gas-producing bacteria. They also form spores, which can live in soils for many years. The microbes cannot spread Blackleg from one animal to another simply by contact. 

Common Symptoms

  • Cattle not being able to walk properly
  • Loses interest in food
  • High temperature
  • Swelling that develops in shoulder, back, neck
  • These swellings make a cracking sound under pressure
  • Gas is formed inside the enlarged swellings


  • Blackleg is caused by a spore-forming bacterium. The spores can survive in soil for many years. After they are ingested from pasture by the animal, they then enter the bloodstream. In this way they can remain in the muscles without causing any problem. This is the danger of Blackleg. Seemingly healthy cattle and sheep can also be infected without showing any outward signs. Blackleg kills affected animal very fast. So, it is futile to treat one animal at a time. 

    Treatments
    In the early stages of Blackleg, treatment with penicillin or other antibiotics in large doses is helpful. The cattle which recover from this disease may have a weak muscle in legs, shoulder, etc. 
    Vaccines & Prevention
    Blackleg can be prevented by vaccination. The most commonly used clostridial vaccination in cattle is a 7-type prevention vaccine. It gives your cattle full protection from 7 microbes including the one responsible for Blackleg. The best way of preventing more instances of Blackleg will be by revaccinating animals. Burning the upper layer of soil to eliminate spores with oil or straw also works well.
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