THIRTEENTH ANNUAL YEAR BOOK— PART VIII 483 



Dr. Stange: Not unless the hogs that have been vaccinated 

 show symptoms of the disease. They should not show symptoms. 

 If they do, it shows that the serum was not sufficiently potent. 



''How are you going to find outT' 



Dr. Stange : It should be tested. You have to depend upon 

 th€ manufacturer unless you want to experiment yourself and test 

 it out before you use it. I understand that the Bureau of Animal 

 Industry at Washington has in mind the supervision of the manu- 

 facture of the serum. This has all been worked out by the gov- 

 ernment and the government has a patent on this method so 

 that no private individual can get a patent on the process and 

 exclude all other manufacturers. That is why we have so many 

 serum establishments around the country. Everyone is at lib- 

 erty to do so. 



"In case you do make this mistake and inoculate your herd with 

 hog cholera, what is the proper thing to do theni" 



Dr. Stange : The thing to do then is to get some serum that you 

 know is good as soon as you can and give them large doses of it. 



''Do you give them the double treatment all at the same time?" 



Dr. Stange : I would inject the blood on one side and the serum 

 on the other side. Do not mix it. The serum has very few if any 

 curative properties — it is preventative. You can't expect to cure 

 many hogs with the serum. 



"If you try to keep your whole herd immunized, when do you 

 work on the little pigs?" 



Dr. Stange : About the time they weigh frum twenty to thirty 

 pounds or about weaning time unless there is some danger of the 

 pigs becoming infected with hog cholera before that time. They 

 carry the immunity for considerable time. 



"How does the cholera hog look on the inside?" 



Dr. Stange: The disease affects the kidneys, the bones, the 

 lymphatic glands and the skin. The bones show darkening of the 

 marrow. In the packing house when a hog is split down the 

 center you can see the marrow of the spine and other bones looks 

 black. Then the skin under the surface of the body gets bluish 

 or blackish and often you can see this before the animal dies. You 

 do not want to mistake that for the black discoloration that hogs 

 have after they die and lie for some time. When hogs have cholera 

 this dark color is usually found around the abdomen and around 

 the ears. The kidneys are spotted and look as though you took 

 blood on the finger and snapped your finger. These little specks 



