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BLACKLEG

Blackleg is a highly fatal disease of young cattle caused by the spore forming, rod shaped, gas producing bacteria Clostridium chauvoei.  The spores of the organism can live in the soil for many years.  The bacteria enters the calf by ingestion and then gains entrance to the body through small punctures in the mucous membrane of the digestive tract.  Cattle that are on a high plane of nutrition, rapidly gaining weight and between 6 months and 2 years of age are most susceptible to the disease.  The disease is not transmitted directly from sick animals to healthy animals by mere contact.

The first sign observed is usually lameness, loss of appetite, rapid breathing and the animal is usually depressed and has a high fever.  Characteristic swellings develop in the hip, shoulder, chest, back, neck or elsewhere.  First the swelling is small, hot and painful.  As the disease progresses, the swelling enlarges and becomes spongy and gaseous.  If you press the swelling, gas can be felt under the skin. The animal usually dies in 12 to 48 hours.  In most cases the animal is found dead without being previously observed sick.  The speed with which blackleg kills usually makes individual treatment useless.

Blackleg is almost entirely preventable by vaccination.  The most commonly used clostridial vaccination in cattle is the 7-way type which protects against Clostridium chauveoi (blackleg), Clostridium septicum and Clostridium sordelli (malignant edema), Clostridium novyi (black disease), and three types of Clostridium perfringens (enterotoxemia).


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Information contained in this article from one or more of the following:
Alabama Cooperative Extension System
South Carolina Extension Service
Nebraska Extension Service
Oklahoma State Cooperative Extension Service
University of Nebraska Cooperative Extension
University of Minnesota Extension Service

 
  

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