236 ANNUAL, REPOETS OF DEPARTMENT OF AGRICULTURE. 



Cattle slaughtered, appraised value, indemnity allaived, etc. — Continued. 



ERADICATION OF TUBERCULOSIS FROM SWINE. 



Attention has been given in practically every State in which the 

 swine industry exists to- tracing the sources of infection of swine 

 with tuberculosis. Frequent tests of known infected herds of swine 

 have been made with good results. It is believed that the area eradi- 

 cation work among cattle will eventually eliminate tuberculosis from 

 swine, as the greatest source of infection in swine is known to be 

 through following diseased cattle or drinking unpasteurized skim 

 milk from creameries. Continued attention is being given to pub- 

 licity regarding modes of infection and means of prevention, with 

 such tuberculin testing as is deemed advisable in the breeding stock. 



REGULATION OF INTERSTATE MOVEMENT. 



Regulation 7 of B. A. I. Order 273, governing the interstate move- 

 ment of cattle so far as tuberculosis is involved, has worked smoothly. 

 The 8,389 veterinary practitioners authorized to make tuberculin 

 tests of cattle for interstate shipment tested for that purpose 199,789 

 cattle, of which 2,443, or 1.2 per cent, reacted. Regularly employed 

 bureau inspectors tested at public stockyards 37,801 cattle, from 

 which there were removed 601 reactors, or 1.6 per cent. 



Permits were issued for the intei^tate movement of 34,232 known 

 reactors for immediate slaughter and for 12 animals which were 

 returned to the original owners for breeding purposes. 



TUBERCULIN TESTING. 



Advantage was taken of the large number of tuberculin tests of 

 cattle (3,460,849) to gather and study data as to the results with the 

 various tests and combinations so as to enable the veterinarians to 

 improve their knowledge of the subject and to standardize methods 

 throughout the service. Statistics of tests by the various methods are 



