146 HOG CHOLEEA 



If the temperatures vary between normal and a 

 little above 104 F. and if there is no visible dull- 

 ness, serum alone may be given to the sick ani- 

 mals only; but if sickness appears before the 

 tenth day, if several hogs are dull, or if a number 

 of them show temperatures near 106 F. the entire 

 herd should receive full doses of serum alone 

 without delay. Most "breaks," taken in time, can 

 be checked. 



Abortion in sows has been caused by simultane- 

 ous treatment, but it is rather unusual, and occurs 

 most frequently during "breaks" due to the 

 causes we have mentioned. Sows near farrowing 

 time certainly should not receive serum and virus, 

 but when they are in the early period of gestation 

 we are frequently compelled to assume the slight 

 risks as a necessary evil. 



Stunting may result from simultaneous treat- 

 ment, and we are told that one of America 's most 

 famous pure-bred breeders had his herd ruined by 

 unthriftiness following vaccination. We do not 

 know the particulars, but we do know that such 

 consequences need not follow simultaneous treat- 

 ment judiciously administered, and we know that 

 hundreds of pure-bred breeders maintain fine 

 herds immune, and are satisfied. We have al- 

 ready enumerated a few of the factors which cause 

 "breaks." Any one of these may cause death, or 

 falling just short of such a result, stunt the ani- 



