142 Serums 



product, and various other reasons might F> ; given for the failure of ser- 

 ums in the beginning of their use. Any m< dicine might fail if not prop- 

 erly used. 



First, if you are going to immune your hogs by the use of serum, 

 get a high class product. Nearly all experiment stations or agricul- 

 tural colleges put out serum as cheap as a dependable product can be 

 made. In fact, they put it out at as near cost as possible. After obtain- 

 ing a known product, put in the full dose as directed. 



It does not pay to under estimate the weight to reduce the serum 

 cost. Many experiment station men consider the serum alone method 

 safe for any one to use, while other stations advise the employment of a 

 veterinarian. 



With the serum alone method the farm that hasn't got hog cholera 

 on it doesn't become infected, and it does not effect the reproductive 

 powers of the sows or gilts. However, pigs under 75 pounds out grow 

 the immunity in from 4 to 8 weeks, and must be vaccinated again, espe- 

 cially on farms where cholera has been. However, on farms that haven't 

 had cholera, the rage may get over in tliat length of time and revaccina- 

 tion may not be necessary. 



Hogs over 100 pounds usually can be marketed before they lose 

 their immunity, and mature hogs usually stay immune. The older the 

 hog, the greater the length of the immunity when the single method is 

 used. 



THE SIMULTANEOUS METHOD 



This method of immuning consists in using anti-hog cholera serum 

 and virus. The organism causing the disease and anti-hog cholera ser- 

 um are placed in the hog at the same time but the injections are made 

 with a separate syringe. Most experiment stations agree that one well 

 informed on such work should make the injections. In 'some states it 

 is a penalty of from $100 to $500 for any one other than veterinarians 

 or representatives of experiment stations to use this method. 



By the use of the simultaneous method, the hog becomes immune 

 for life. 



Some of the disadvantages are 



I The losses due to vaccination are a little higher than by the use 

 of the serum alone method. 



