152 HOG CHOLEEA 



6. May cause abortion in pregnant sows, and 

 may stunt pigs if they are treated while their re- 

 sistance is low. 



Simultaneous treatment is indicated in herds 

 where hog cholera virus is almost sure to find its 

 way sooner or later, but where actual infection of 

 the herd may be delayed several weeks or months. 

 Such conditions exist: 



1. In sound herds on infected farms. 



2. In other herds immediately threatened with 

 cholera. 



3. In some show hogs. See " handling show 

 hogs" in Chapter IX. 



4. On farms on which hog cholera has appeared 

 periodically. 



5. In very large herds in which there is con- 

 stant exchange of animals. 



6. In garbage-fed herds. 



Simultaneous treatment is contra-indicated: 



1. When it cannot be applied by experienced 

 men. 



2. When the entire herd cannot be immunized. 

 (Some may, if necessary, receive serum alone, but 

 none must be left susceptible.) 



applies more specifically to the degree and quality of flesh an 

 animal carries, as well as to the appearance of the coat, and is 

 determined, in hogs, principally by inspection. Fat hogs recently 

 shipped or fat sows that have recently farrowed, though in good 

 condition, will not tolerate simultaneous treatment nearly as well 

 as ordinary farm hogs in very moderate flesh. The ' ' resistance ' ' 

 of the latter is higher, although their " condition ' ' is lower. 



