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PRINCIPLES OP VETERINARY SCIENCE 



barley awns, oat stubble, and various grasses, but has never 

 actually been found growing outside the animal body. 



Symptoms. — A hard, slowly developing, tumor-like swelling 

 occurring on the jaw is the only symptom of importance during 

 the early stages of the disease (Fig. 86). The bunch feels as if 

 it were attached to the bone. In the later stages the roots of the 

 teeth in the affected part become ulcerated. This causes diffi- 

 culty in mastication and profuse slobbering of saliva. Pro- 



Fig. 86. — Lump jaw or actinomycosis of Ayrshire bull. 



gressive emaciation occurs from inability of the animal to masti- 

 cate its food properly. 



Treatment. — When begun early, treatment with potassium 

 iodid internally and tincture of iodin or iodin petroxalin exter- 

 nally give good results. The dose of potassium iodid is 2 to 4 

 drams once a day until symptoms of iodin poisoning appear 

 (watery eyes, loss of hair and appetite, scurvy skin and general 

 weakness). The medicine must then be discontinued for a week. 

 Laxative feeds are recommended as a preventive of constipation 

 during the period when iodin is being given. This drug should 



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