THE MOST COMMON DISEASES OF SWINE 553 



monetary point of view the eradication of the (hsease 

 would, in itself, within a very few years, make good the 

 expense incurred, through the saving of animals that 

 would otherwise he condemned. 



The number of herds in which tuberculosis exists is 

 small as compared with tlie number of animals affected, 

 'i'his fact in one wa\- makes the eradication problem 

 easier; but in another it is thereby the more difficult, since 

 farmers generally do not realize that the dangers from 

 tuberculosis are much greater than those from cholera, 

 which leaves ravages so boldly apparent to the eye and 

 the pocketbook. Dr. Burton Rogers of the Kansas experi- 

 ment station is satislied, as a result of investigations made 

 at different times, that less than six per cent of the hog 

 raisers of the country send to market animals affected 

 with tuberculosis. Pie found, in tagging 3,430 hogs, 

 brought to market in 626 different wagons, that only 39 

 farmers had brought in hogs that were affected. This 

 was in a district where tuberculosis was supposed to be 

 especially prevalent. Dr. Rogers believes that the only 

 solution of the animal tuberculosis problem is for the 

 94 per cent of the farmers who do not ha\e tuberculosis 

 in their herds to insist upon the stamping out of the dis- 

 ease by the six per cent who own affected herds. 



The Bureau of Animal Industry (Bulletin No. 88) 

 says: "The feces of cattle that swallow tubercle bacilli 

 are highly infectious for hogs that are exposed to them. 

 The feces of tuberculous cattle very probably contain 

 numerous tubercle bacilli that reach the intestines through 

 swallowing or otherwise. . . . We judge from ex- 

 periments made in which hogs were fed large quantities 



