118 THE COW IN HEALTH AND DISEASE 

 Tuberculosis. 



This condition can not be determined defi- 

 nitely by a physical diagnosis, but requires 

 the tuberculin test to confirm the diagnosis. 

 This disease is quite common in old dairy cows 

 which have been heavy milkers. It manifests 

 itself usually in hard tumorous masses of dif- 

 ferent sizes. Sometimes the udder will yield 

 a thick heavy yellow substance which resem- 

 bles pus which may in reality be a tubercular 

 abscess, but more often it is a hard firm mass 

 which can be very readily felt upon palpita- 

 tion of the udder. When such a condition of 

 the udder is found the presence of tuberculosis 

 should be suspected and the tuberculin test 

 should be immediately applied to confirm or 

 disprove the diagnosis. 



Tumors of the Udder. 



If the tuberculin test fails to show tubercu- 

 losis in those cows whose udders contain hard 

 indurated masses that are discernible by 

 manipulation, it is plain that we then have a 

 tumor of the udder. These growths are usual- 

 ly benign in character in comparison to those 

 of the human family which are usually malig- 

 nant or of the cancer variety. Surgical inter- 

 ference is not practiced for this class of con- 

 ditions and it is not often that medicinal treat- 

 ment would be of much value. 



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