26 Commission Report: Tuberculosis. 
those that proved to be healthy. Each class of cattle is kept 
entirely separate from the other, in different stables when pos- 
sible, and under the care of separate attendants, using separate 
utensils. The calves born of the diseased cows are removed from 
their mothers at birth and placed in the stable with the healthy 
animals where they are reared upon the milk of healthy cows 
or upon other milk which has been properly pasteurized. In. 
this way the healthy portion of the herd constantly increases 
while the diseased animals are disposed of as rapidly as may be 
deemed necessary until finally all of them are gone and the 
remaining herd is composed entirely of healthy cattle. The 
tuberculin test is applied to the healthy herd at regular inter- 
vals, annually or semi-annually, in order to detect any cases of 
latent tuberculosis or recent infection which may appear. 
A modification of the Bang system is Ostertag’s method of 
suppressing tuberculosis. This system demands only a clinical 
examination of the original herd with the elimination of all open 
cases of tuberculosis. The calves from the remaining cows are 
immediately removed and brought up on pasteurized milk in 
the same manner as in the Bang system and a new herd is thus 
established from the young stock. Healthy nurse cows could 
be used for these calves instead of feeding them on pasteurized 
milk. The tuberculin test is applied to this new herd at stated 
intervals in order that any cases of tuberculosis which may de- 
velop therein may be discovered promptly. Neither of these 
systems, however, has met with much favor in this country as 
it required a considerable length of time and care, to create a 
herd free from tuberculosis by either of them. Nevertheless the 
inauguration of Bang’s or Ostertag’s method in herds of valu- 
able animals whether they be dairy or beef breeds is unquestion- 
ably of an economic value and in such cases either of these 
systems should be encouraged. On the other hand, in ordinary 
beef or dairy herds the practice of Bang’s or Ostertag’s method 
in this country has not met with much encouragement, owing 
to the extraordinary supervision, time and labor, as well as the 
loss of market milk from the reacting cows which it involves. 
In such herds the best ultimate results have thus far been 
Mec st e Sr saya of all the clinically affected 
the milk a the ore eee nia a 
frain from selling the raw milk i a pen ote 
rom the infected herd at all. 
