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IOWA DEPARTMENT OF AGRICULTURE 



No. 4. — The cow shown in this Picture is in excellent condition for an animal 

 that has been affected with tuberculosis more than four years. Three 

 Shears before her picture was taken tuberculosis germs were found 

 in her dung and hogs that were permitted to eat her dung became 

 tuberculous. 

 About 2% years before her picture was taken it was found that the 

 milk of the cow contained tuberculosis germs. There was nothing 

 visible about her udder to show that it was diseased and it was only 

 after two months of the most careful tests of her milk that an 

 expert could tell from which of the four quarters the disease germs 

 were being passed. 



