126 DISEASES OF SWINE 



their vitality and slough off. Raised ulcers follow 

 the sloughing in the stomach and intestines. 

 These are among the most characteristic lesions 

 of the disease and may involve a large part of the 

 lining membrane of the small intestine, resemb- 

 ling in appearance a croupous membrane. The 

 ulcers may be confined to the last of the small 

 intestine, and the beginning of the large (region 

 of the ileo-cecal valve). The small ulcers are cir- 

 cular in outline, margins irregular and slightly de- 

 pressed below the surface of the mucous mem- 

 brane, and brownish, yellowish, or reddish in color. 

 After a few weeks they show evidence of healing 

 and the part is more or less filled in with scar 

 tissue. 



The liver and kidneys may show indications of 

 having undergone degenerative changes. 



The lungs may be involved secondarily and 

 show scattered, inflamed pneumonic centers. How- 

 ever, this is not a constant lesion, and when the 

 lungs are diseased to any great extent, it indicates 

 the presence of .the germ of swine plague. 



Preventive Treatment. — Preventive measures con- 

 sist in using all passible precaution against 

 the carrying of the germs of the disease into the 

 hog lots, the use of healthful, sanitary hog blouses 

 and surroundings, and in keeping the herd in a 

 healthy, vigorous condition. 



Hogs from other herds should be excluded from 

 the hog lots until we are positive they are not 

 diseased. Such animals should be quarantined in 



