HOGS 
123 
foods and a light dose of copperas will prevent serious 
trouble. 
Fig. 89.—Hog cholera immunization. The pig is placed in a special trough so 
that he cannot squirm during the operation. 
Hog Cholera.— A contagious disease should be 
avoided by preventing the pigs coming into contact with 
others that might be diseased. Immunization is the 
accepted form of preventing hog cholera. A veterina- 
