Methods of Eradication. 



segregation, and the healthy ones must be kept from contact with 

 reacting animals. 



Of the calves which are born after the separation, those from 

 non-reacting cows remain with their mothers; the calves from 

 reacting cows, after receiving the colostrum from their mother on 

 the first day after birth, should be placed in the stable of healthy 

 animals, and should be fed with the milk of healthy cows or should 

 be brought up on sterilized milk, or they may be allowed to suck 

 from healthy nurse cows. As soon as possible after weaning the 

 calves should also be subjected to the tuberculin test, and those giv- 

 ing a reaction should be immediately removed. From 1 to "2% 

 of these calves react. 



It is proper to place the healthy calves in a stable of healthy 

 young stock, and they may pasture with them, or if this is not pos- 

 sible they should be placed with the older non-reacting group of 

 animals. Before the first breeding the heifers again should be 

 subjected to the tuberculin test, in order to place them in the prop- 

 er group of cows. 



The tuberculin test is annually repeated in the healthy herd, 

 in order to eliminate the animals which in the course of the year 

 have had a possible opportunity of becoming affected with 

 tuberculosis. 



Newly purchased animals are clinically examined and tested 

 with tuberculin, and are added to the healthy herd only when the 

 results are entirely satisfactory. 



The male animals which are to be used for breeding purposes 

 should not react to the tuberculin test. Under unavoidable cir- 

 cumstances, a reacting bull may be reserved for breeding pur- 

 poses but only under special precautionary measures. 



The results of Bang's eradication method, if carefully carried 

 out, are remarkably satisfactory. 



It has been adopted to the greatest extent in Denmark, Sweden 

 and Norway, and it has also been successfully carried out in Hun- 

 gary and Finland. 



The report of Regner, in 1911, affords a good review of the 

 results of Bang's method, and in it are described the results of the 

 governmental eradication of tuberculosis in Sweden. Regner di- 

 vides the eradication work into an offensive one in herds in which 

 the disease prevails, and into a defensive procedure whose purpose 

 is the prevention of the introduction of diseased animals into herds 

 free of tuberculosis. 



Of the groups into which Regner separates the herds and the 

 animals, the first group includes those which originally (on the 

 first tuberculin test which in some instances was applied years 

 previously) were found tuberculous. At that time 16,852 animals 

 had been tested with a percentage of 30 . 2 reactors. In 1908, 18,719 

 animals in 457 herds proved to be entirely free from tuberculosis. 

 % The herds of the second group, which proved to be tuberculous 



