128 COMMON DISEASES. 



In these features of normal spleen, normally clotting blood and 

 gas filled tumor, this disease differs from true anthrax. 



Prevention. — As soon as the disease appears cattle under 

 two years of age sliould be promptly changed to another and pre- 

 ferably higher pasture. If the young cattle have been on dry 

 food then this should be changed. 



Vaccination is now conceded to be very satisfactory and thor- 

 oughly practical. There are a number of commercial black leg 

 vaccines on the market, that are quite reliable. The Federal 

 Bureau of Animal Industry is supplying what is known as the 

 government black leg vaccine. This vaccine is quite satisfactory. 

 Method of vaccination depends upon the kind of vaccine used. 

 Directions usually accompany each shipment from any of the re- 

 liable makers. The government vaccine is a brownish powder, 

 put in small packets of lO and 25 doses. 



This powder is moistened with a little boiled water, then 

 more boiled water is added ; the whole is filtered and the liquid 

 passing through the filter constitutes the vaccine which is injected 

 by a hypodermic syringe. Injection is usually made on the side 

 of the neck or back of the shoulder, through a skin area which 

 has previously been disinfected. 



Treatment. — Medical treatment for this disease is not con- 

 sidered satisfactory, or as a rule worth while. Prevention by 

 vaccination is easily applied, inexpensive and usualh'' satisfactory. 



