126 Agricultural Bacteriology. 



The temperature of the hog is much more variable than 

 that of the cow. During the test the animal must be 

 kept perfectly quiet, which can be done only by placing 

 it in a narrow crate so that movement is impossible. 



Tuberculosis of fowls. The disease in chickens and 

 other barnyard fowl is due to a different variety of the 

 tubercle bacillus than that causing the disease in cattle 

 -and man. It has caused great loss in many flocks. The 

 most important symptoms are emaciation, although the 

 appetite is good. The eyes are bright, until shortly be- 

 fore death, although the fowl may be weak and move 

 about but little. The birds are often lame due to the 

 disease in the joints. 



Of the internal organs the liver is most affected. At 

 first it shows small, grayish points, later, yellow patches 

 appear. 



Differential diagnosis. There are some diseases of 

 cattle and sheep that are often mistaken for tuberculosis, 

 especially those in which nodules are produced in the 

 walls of the intestines by animal parasites. Sheep are 

 affected with an intestinal disease known as " nodular 

 disease" which to the uninitiated might -be thought to 

 l)e tuberculosis, but which is really caused by a parasitic 

 worm which burrows in the wall of the intestine forming 

 :a greenish colored nodule about the size of a pea. 



