32 Report oF DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
The possible long period of incubation and duration of the dis- 
ease, the frequent encapsulated condition of the lesions and the 
absence of immunity from a natural infection are important factors 
to be considered in the application of any method for its elimination 
or control. 
THE BANG METHOD. 
The Bang method for handling tuberculosis is simply the pro- 
cedure recommended and carried into effect in Denmark by Prof. 
B. Bang of the Copenhagen Veterinary College. The object of 
this method is to replenish a tuberculous herd with as little loss 
as possible. It requires that all animals that show physical symp- 
toms of the disease shall be destroyed. Those which give a tuber- 
culin reaction but which exhibit no evidence on physical examina- 
tion of being tuberculous are isolated. They are kept for breeding 
purposes. The reacting animals are carefully watched and if any 
of them develop obvious symptoms of the disease they are slaugh- 
tered. 
The method as originally proposed has been modified from time 
to time in accord with increased knowledge of the disease and 
the conditions under which it exists. The success of the method 
rests in the fact that it conforms to the chronic nature of the 
disease and its tendency to become arrested. The large percentage 
®(35.4%) of dairy cows in Denmark that reacted to tuberculin 
suggested the importance of replenishing the herds with healthy 
cows before the total destruction of the reacting ones. The method 
is summarized in the following statements. 
1. A herd is tested with tuberculin. The animals that are in 
a bad condition are slaughtered. ‘The reacting animals that show 
no physical evidence of the disease are isolated. They are kept 
for breeding purposes. 
2. The offspring from the reacting cows are promptly removed 
from their dams and fed milk from non-reacting cows, or the 
pasteurized (heated to a temperature of 85° C. (185° F.)) milk 
* Bang, B. The struggle with tuberculosis in Denmark. The Veterinarian, 
68 :688, 1895. 
Bang, B. Tuberculosis of cattle. Penn. Dept. of Agr., Appendix Bul. 7s, 
1QOI. 
"Loc. cit. 
