INFLUENCE OF DISEASE UPON MILK 95 



first vigorous, later weak. The respiration is often unchanged, 

 but in advanced cases it is usually rapid and labored. Sometimes 

 there is a purulent nasal discharge. Percussion does not 

 usually give much information ; on auscultation increased vesicu- 

 lar murmur, rales, and indefinite sounds may be detected. These 

 symptoms are usually accompanied by anaemia, unthr if tines s, 

 emaciation, dull and sunken eyes, variable or poor appetite, 

 diarrhoea, repeated bloating after meals, or distention of the ju- 

 gular vein. In advanced cases the pulse is accelerated and soft. 



(6) Intestinal Tuberculosis. The symptoms of intestinal 

 tuberculosis are not characteristic. Repeated attacks of colic 

 and constipation alternating with diarrhoea are the most sus- 

 picious. The intestinal discharges may be quite fluid and 

 frequently contain mucus and pus, sometimes blood. The diges- 

 tive disturbances which are nearly always present in advanced 

 tuberculosis are usually due to the involvement of the intestines, 

 but on the other hand, they may be entirely absent when the 

 intestines are tuberculous. 



(c) Tuberculosis of the Uterus. A turbid, mucous or muco- 

 purulent discharge, yellowish or rather ichorous and of foul 

 odor, is a constant symptom of tuberculosis of the uterus. Frag- 

 ments of caseous material or streaks of blood are sometimes 

 present. The cow is sterile and frequently in heat. On rectal 

 examination the sacral lymph-glands may be found enlarged or 

 the horns of the uterus hard and nodular. 



When the mucous membrane of the vagina or vulva is tuber- 

 culous, ulcers or nodules are present, together with a similar 

 discharge. 



Enlargement of the superficial lymph glands is an important 

 symptom. 



While these symptoms in themselves are not sufficient to 

 justify a positive diagnosis of tuberculosis, nevertheless when 

 they are presented by an animal in a herd in which tuberculosis 

 is known to exist, and when other possible causes for them can 

 be excluded, an error will not often be made if the animal is 

 regarded as tuberculous. In doubtful cases the tuberculin test 

 can be applied or a microscopic examination or an inoculation 

 test made. 



