i86 



TUBERCULOSIS 



Tuberculosis of the udder is detected by an enlargement 

 and hardening of the affected part, usually by the absence of 

 ^ pain and the fact that the 



secretion is not altered un- 

 til the part has been dis- 

 eased for some time. In 

 advanced cases, instead 

 of milk, the udder se- 

 cretes a yellowish, cloudy 

 and sometimes fiocculent 

 liquid. In acute, 

 rapidly developing cases, 

 there may be pain and 

 edema of the skin. In 

 nearly all cases of udder 

 tuberculosis the supra- 

 mammary lymphatic glands 

 situated above the udder in 

 the middle of the escutch- 

 eon, are enlarged and hard. 

 If there is doubt as to the 

 character of the disease of 

 the udder, the milk, or 

 possibly a piece of excised 

 udder tissue, may be ex- 

 amined bacteriologically. 



In tuberculosis of the 

 brain, the animal is un- 

 steady and uncertain in its 

 movements. It lies down 

 much of the time, is usually 

 subject to occasional cramps 

 and is apt to carry the head 

 in an unusual position. 

 Such cases are inclined to 



Fig. 33. Trachea and bronchial tubes 

 of bovine lungs showing attached 

 bronchial glands, (a-a') Supply right 

 and left caudal lobes, {b.b') supply r. 

 and I. ventral lobes, (c-C) branches of 

 the right supernumerary bronchus, 

 {(?) supply left cephalic lobe, {d) 

 branch to azygous lobe, (e) trachea. 

 A. Left bronchial lymph gland. B. 

 Right bronchial lymph gland. C. 

 Lymph gland base of supranutnerary 

 bronchus. D. gland often between 

 bronchi. The glands A. to D., are 

 often involved (Smith). 



advance rapidly and termi- 

 nate in death following coma or convulsions. 



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