FIFTIETH ANNUAL CONVENTION 171 



export trade will depend largely on the class of animals 

 now sold. If a reputation for producing cattle free from 

 tuberculosis and other infectious diseases is established, 

 American breeding stock will be in demand all over the 

 world. 



The United States breeders have knowledge of the 

 areas in foreign countries from which it is safe to import 

 animals, and also have information of certain localities and 

 even of numerous herds out of which it would be dangerous 

 to purchase animals on account of tuberculosis. It is only 

 reasonable to expect that precautions based on sfimilar 

 knowledge will be taken by breeders of other countries to 

 protect their live-stock industry from disease. The accred- 

 ited-herd list of tuberculosis-free herds indicates to the 

 foreign as well as the domestic buyer where he may obtain 

 cattle officially recognized as free from that disease, and 

 the time will come when prospective buyers will be reluc- 

 tant to make speculative purchases from unlisted herds. 



The following table shows the number of herds and 

 the number of cattle in each State under supervision for the 

 control and eradication of tuberculosis. It indicates also 

 the location of inspectors in charge of this work. Owners 

 desiring information on the subject of tuberculosis are re- 

 quested to write to the inspector in charge of the work in 

 the State in which the cattle are located. 



Tuberculosis in Swine. 



Eradicating tuberculosis from cattle will practically 

 solve the problem of controlling the disease among swine. 

 That is the opinion of veterinary experts experienced in the 

 handling and post-mortem examination of swine received at 

 the principal market centers. By means of a simple and 

 practical marker, hogs may be tattooed with distinguishing 

 letters and figures, and when disease is found by post-mor- 

 tem examination the identity of such animals is known. 

 With a simple system of records it is thus possible to trace 

 a shipment to the farm from which it came and stamp out 

 infectious diseases at their source. Evidence shows that 



