THIRTEENTH ANNUAL YEAR BOOK— PART XI 



RESULTS OF TESTS ON STATE HERDS. 



575 



*No\v cattle. 



HOG CHOLERA. 



During this biennial period farmers of loAva have suffered heavy 

 losses as the result of wide spread outbreaks of cholera. Losses 

 from this disease we expect will be reduced to the minimum in the 

 near future when the state becomes thoroughly organized to com- 

 bat, control and eradicate cholera. This we believe can be accom- 

 plished by the direct application of sanitary regulations and quar- 

 antine together with the use of anti-hog cholera serum. 



The following article written by Dr. D. E. Baughman, Assist- 

 ant State Veterinarian, Ft. Dodge, Iowa, will prove entertaining 

 and instructive to all parties interested in the swine industry of 

 Iowa. 



THE METHOD OF USING ANTI-HOG CHOLERA SERUM. 



In order to properly understand the method of using this serum, it 

 would be well to first understand the method of making it. In order 

 to make potent serum that has the power to protect a hog against 

 cholera, it is necessary to have cholera pigs to draw the blood from. The 

 younger the diseased pig that the blood is taken from and the more 

 acute the strain, the more virulent the blood will be, and the more 

 virulent the blood is that is used for hyper-immunizing, the more potent 

 the serum will be. 



It is impossible to make a potent and reliable serum where pigs are 

 used to furnish virulent blood, with unknown form and virulency of dis- 

 ease, as is done with some of the serum firms, that depend entirely upon 

 the supply of their diseased pigs from the markets or large packing 

 plant, although this method has its advantage, in that this diseased 

 blood can be had for a small sum, if they pay for them at all. These 

 plants can make serum and sell it for much less than where it is 

 made by the original method, as was intended by its inventors. But 



