Actinomycosis or lumpy jaw produces immovable hard swellings on the
upper and lower jawbones of cattle, commonly at the central molar level. It
is caused by an anaerobic micro-organism, Actinomyces bovis. The
bacterium invades tissue through breaks in the lining of the mouth caused
by eating rough forage. The tumor-like swellings develop slowly
and may take several months to reach a noticeable size. Lumpy jaw
may be well advanced before external signs are visible. The lumps
consist of honeycombed masses of thin bone filled with yellow pus. If
neglected the swellings may become very large. In advanced cases
openings develop and discharge small amounts of sticky pus containing
gritty yellow granules.
The most common treatments are iodine therapy or tetracyclines. Treatment is often ineffective. If the disease is detected early, it may be better to dispose of the animal while it is still in good condition. Only the head should be condemned by meat inspectors, unless the lesions have spread elsewhere in the body.
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