FIFTIETH ANNUAL CONVENTION 125 



applicable to cattle which have been tested frequently, and 

 among herds which are or have been extensively diseased. 



Eradication From Swine. 



With the gradual elimination of tuberculosis from cat- 

 tle, the disease among swine will grow correspondingly 

 smaller. It is not necessary to tuberculin test all the swine 

 herds because, with the exception of valuable breeding ani- 

 mals, it is more economical to slaughter the diseased ones 

 when fat than to undertake to exterminate the disease in 

 any other way. 



In the case of suspected, valuable pure-bred swine, 

 their freedom from tuberculosis can be determined definite- 

 ly by the intradermic method, which is practicable and re- 

 liable. 



The injection is near the base of the left ear; the other 

 ear acts as a check or comparison. A reaction is mani- 

 fested by a swelling in the region where the tuberculin was 

 injected. The swelling may appear any time from the 24th 

 to the 104th hour after injection and will remain for sev- 

 eral days. As in the case of cattle, diseased swine should 

 be removed from the farm, and the sheds, farrowing hous- 

 es, and the lots should be thoroughly cleaned and disin- 

 fected. 



Measures of Prevention. 



Since, after many years of study and experience, no 

 satisfactory cure for tuberculosis among animals has been 

 found, prevention of the disease is extremely important. 

 State and Federal Governments have made vigorous efforts 

 to stop the spread of the disease by regulating the move- 

 ments of cattle, and recently, with that object in view, 

 action has been taken in some localities to regulate the 

 movement of cattle from one county to another. Regula- 

 tion of inter-county movement should be encouraged be- 

 cause it brings the matter nearer home to the live-stock 

 owner. It is he who must take a very important part all 

 through the campaign of tuberculosis eradication, and if he 

 is in favor of measures to prevent the spread of the disease 



