554 SWINE IN AMERICA 



of such milk that of the two methods — the exposure of 

 hogs to the feces or to the milk of tuberculous cattle — the 

 former has by far the greater damage, eutirely apart 

 from the fact that exposure to the feces in the manner 

 in which it occurs is never a simple exposure to one thing, 

 but a general exposure to all the infectious material that 

 may pass from cattle, irrespective of whether they are 

 milk-producing animals or not. . . . It is a question 

 whether the tuberculosis that occurs among hogs as- 

 sociated with dairy establishments is not more directly 

 traceable to the feces of tuberculous cows than to skim 

 milk. 



"No farmer and no aairyman who is acquainted with 

 the value of the undigested grain or other nutriment in 

 cattle feces as a food for hogs, fails to feed as much of 

 it as he possibly can. . . . The system in practice in 

 many portions of the country of turning a herd of hogs 

 behind a herd of cattle that are being fattened for market 

 may be accountable for tuberculosis among hogs if the 

 disease exists among the cattle. Hogs associated in this 

 way with cattle may be protected effectually from tuber- 

 culosis by applying the tuberculin test to the cattle and 

 removing every animal from the herd that shows a reac- 

 tion indicative of the presence of tuberculosis. And it 

 is strongly recommended that in regions where tuber- 

 culosis among hogs has been discovered, the cattle with 

 which they are associated be first of all tested, and re- 

 acting animals segregated or disposed of in a way that 

 will insure against further harm from them. . . . 



"The feces of tuberculous cattle are a menace to hogs 

 even when not deliberately fed to them. Very few es- 



