Udder Tuberculosis. 



97 



TUBERCULOSIS. 



Occurrence of Tuberculosis in Cattle. 



Tuberculosis of the udder in cows appears with relative fre- 

 quency, corresponding to the frequent occurrence of tuberculosis 

 in cattle. 



Tuberculosis in the udder is manifested in different forms, 

 the circumscribed, lobular, focal tuberculosis and the diffuse tuber- 

 Fit?. 22. 



Tuberculosis of the udder. Progressive miliary form. 



culosis extending over and infiltrating the entire udder. Two of 

 the different forms may be present at the same time in the organ, 

 and from one form through accentuation of the infection the other 

 forms may result. 



Clinically tuberculosis is manifested by nodular swelling or 

 hard enlargement of the affected quarter, and with enlargement and 

 painless nodular swelling of the supramammary lymph glands. 

 These changes, however develop very slowly and the milk from such 

 infected quarters for weeks and months may contain millions of 



