336 



SWINE PRACTICE 



Tubercular involvement of the nervous tissue occurs in swine, but 

 is relativel.y rare. One case has been observed in vs^hich a tubercular 

 center occurred in the cerebral tissue. Tuberculosis of the meninges 

 may be local and circumscribed or diffuse and quite general. 



Osseous tuberculosis is of common occurrence in swine. It is found 

 especially in the vertebra. 



Symptoms. — Tuberculosis is essentially a chronic disease. The onset 

 is usually so insidious that no abnormality is suspected, and the 

 usual clinical examination of swine is not sufficient to predicate a diag- 



Pig. 99. TtTBEKCt'Losis OF THE PLETRA. A, rib; B, masses of tubercles. 



nosis because the symptoms are so indistinct. Lymph-gland involve- 

 ments result in tumefaction. The enlarged glands are not patho- 

 gnomonic of tuberculosis. 



Tubercular invasion of the digestive organs produces indigestion. 

 The digestive derangements develop slowly and usually only in young 

 pigs. They become unthrifty and emaciated as the disease progresses. 



Pulmonary tuberculosis is evidenced by a dry, short, suppressed 

 cough and bv some diffieultv of breathing. The cough becomes more 



