348 MANUAL OF FABM ANIMALS 



ing. For example, if the cows are milked at 6 a.m., inject the 

 tuberculin at 10 p.m. The syringe should be disinfected by 

 drawing it full of carbolic acid, emptying it, and then rinsing in 

 boiling water before beginning the injection. In addition to 

 this, just before injecting each animal, dip the needle in strong 

 carbohc acid to disinfect it. Carefully fill the syringe through 

 the needle from the bottle of tuberculin. Set the burr on the pis- 

 ton-rod of the syringe so that not more than the dose intended 

 can be injected. The druggist will show how this is done when 

 the syringe is purchased. The size of the dose will be stated on 

 the tuberculin bottle. With the cow restrained in a stanchion, 

 or tied short in a stall, take hold of the skin with the left hand 

 along the side of the neck where it is thin and loose and with the 

 syringe in the right hand quickly insert the point in the 

 pocket thus formed and inject the dose. Occasionally some 

 force is needed to insert the needle into the skin. Before in- 

 jecting another cow, see that the syringe is working properly 

 and the needle is in good shape. 



4. Taking temperature after injection. — Begin taking tem- 

 peratures eight hours after the injection of the tuberculin and 

 continue every two hours until six temperatures are taken, and 

 continue those cases showing a rise in temperature. For ex- 

 ample, if the tuberculin was injected at 10 p.m., begin taking 

 temperatures at 6 a.m., then at 8 a.m., 10 a.m., 12 m., 

 2 P.M., and 4 p.m., and make a careful record of each 

 temperature as taken. When an animal shows a rise above 103, 

 it is well to take the temperatures at more frequent intervals. 



5. Interpretation of the temperature records. — The tem- 

 peratures after injecting the tuberculin must be carefully studied 

 and compared with those taken the day before. In typical 

 cases of tuberculosis, an elevation of temperature usually comes 

 on gradually, although in the more pronounced reactions, when 

 the temperature goes above 105.5 degrees, the rise is often rapid. 

 This elevation usually occurs between the eighth and sixteenth 



