90 HOG CHOLEKA 



A weight near two hundred pounds is desirable. 

 The intradermal tuberculin test should be applied 

 to prospective hypers, and all reactors rejected. 



Hypering. The immune is confined in a port- 

 able crate and the snout is secured firmly, drawing 

 the head to one side. Its weight is then obtained 

 and recorded, and it is wheeled to the preparation 

 room in the laboratory. The entire body is wet 

 thoroughly and a cloth dampened in antiseptic so- 

 lution is thrown over it, leaving only the head ex- 

 posed. One of the ears is lathered, shaved, rinsed 

 and washed in antiseptic solution and the hog, 

 thus prepared, is wheeled to the hypering room to 

 receive the required dose of virus. 



The hypering operation consists of injecting 

 into an ear vein five mils of virus blood for each 

 pound the hog weighs. The virus is placed in a 

 graduated bottle which is closed with a rubber 

 stopper, perforated in two places. Through one 

 opening is passed a curved nickeled tube which, ex- 

 tending to the bottom of the bottle, serves as an 

 outlet for the virus when air pressure is applied ; 

 through the other is passed a shorter tube extend- 

 ing just through the stopper and through which 

 air is pumped to produce pressure. Both are ex- 

 tended with rubber tubing, the intake being thus 

 connected with a tank containing compressed air, 

 and the outlet terminating in a slip fitting for the 

 hypodermic needle which is to be introduced into 



