118 DAIRY FARMING 



as a diagnostic agent, but this is of little consequence 

 since the disease is readily recognized in these stages by 

 a physical examination. 



Method of Making the Tuberculin Test. In making 

 this test the following particulars must be observed: 



1. Secure the necessary tuberculin from the govern- 

 ment. 



2. Secure a clinical thermometer, a sharp, hollow 

 needle, and a graduated, hypodermic syringe from deal- 

 ers in veterinary instruments. 



3. Make the test during the cooler season of the year. 



4. Do not test cows shortly before or after calving. 



5. Do not test cows that are in heat, or suffering from 

 garget or other diseases. 



6. Do not allow cows to drink very cold water. 



7. Keep the animals in a normal condition as to feed, 

 confinement, etc., during the test. 



8. Do not test animals which show a temperature as 

 high as 103 F. 



Proceed with the test as follows: First ascertain the 

 normal temperature of the cows by holding a clinical 

 thermometer in the rectum for about five minutes. Three 

 observations are necessary: One at 6 a. m., another at 

 noon, and the last at 6 p. m. At 10 p. m., the same day, 

 inject under the skin at the neck or shoulder, 2 cubic 

 centimeters of tuberculin for animals of about 1,000 

 pounds live weight and proportionally more for heavier 

 cows. At 6 o'clock the next morning take the tempera- 

 ture again as before, but at intervals of two hours until 

 five or six readings have been taken. If the maximum 

 temperature after the injection is two or more degrees 

 higher than it was before the injection of the tuberculin, 

 the animal is considered tuberculous. If the rise of tern- 



