110 HOG CHOLEBA 



a temperature near 106 F. on the fourth or fifth 

 day of the test, and this high level is maintained 

 several days. Other symptoms of hog cholera ap- 

 pear a day or two after the temperature curve 

 starts upward. The pigs which receive protective 

 serum in addition to virus also undergo a reaction, 

 which is slightly delayed and very mild as com- 

 pared to that observed in the virus pigs. In some 

 instances no temperature reaction is discernible, 

 but usually readings reach a point between 104 

 and 105 F., considerable fluctuation between nor- 

 mal and this level being observed. As a rule the 

 casual observer would detect no evidence of a 

 physical reaction, but not infrequently the appe- 

 tite lags just perceptibly for two or three days 

 and in white pigs a slight flush may be observed 

 in the skin. On the whole, all evidence of reaction 

 has usually disappeared from the serum pigs be- 

 fore the tenth day of the test. 



According to Bureau of Animal Industry regu- 

 lations, serum which protects in doses required in 

 their official test is suitable for use in the field 

 under a dosage label as follows : 



Sucking pigs 20 mils 



Pigs, 20 to 40 pounds 30 mils 



Pigs, 40 to 90 pounds 35 mils 



Pigs, 90 to 120 pounds 45 mils 



Pigs, 120 to 150 pounds 55 mils 



Hogs, 150 to 180 pounds 65 mils 



Hogs, 180 pounds and over 75 mils 



