Texas FFA Livestock Judging Practice Test

Blackleg is a severe contagious disease primarily affecting cattle and sheep, caused by the bacterium Clostridium chauvoei. The symptoms you mentioned, such as lameness, depression, fever, and muscle swelling, are closely associated with this disease. Blackleg often manifests when the spores of the bacteria enter the bloodstream, leading to rapid muscle tissue damage and significant inflammation. The muscle swelling occurs because of the accumulation of gas produced by the bacteria during their rapid multiplication within the infected muscle tissue.

Understanding these clinical signs is crucial for timely diagnosis and treatment, as Blackleg can progress quickly and has a high mortality rate if not addressed promptly. Early recognition of the disease can lead to better outcomes, and vaccination can help prevent its onset in healthy herds.