Commission Report: Tuberculosis. 29 
I. Where fifty per cent or more of the animals are infected. 
II. Where a small percentage (15% or less) of the animals 
are affected. 
III. Where a larger number (15% to 50%) of the animals are 
diseased. 
In eliminating tuberculosis from infected herds the following 
procedure is recommended: 
GROUP I. 
Herds where a tuberculin test shows fifty per cent or more of 
the animals to be infected should be treated as entirely tuberculous. 
The procedure here is as follows: 
1. Eliminate by slaughter all animals giving evidence of the 
disease on physical examination. 
2. Build up an entirely new herd from the off-spring. The 
calves should be separated from their dams immediately after 
birth and raised on pasteurized milk or on that of healthy nurse 
cows. This new herd must be kept separate from any reacting 
animals. 
3. The young animals should be tested with tuberculin at 
about six months old, and when reactors are found at the first 
or any subsequent test—the others should be retested not more 
than six months later. When there are no more reactors at 
the six months’ test annual tests should thereafter be made. All 
reacting animals should at once be separated from the new 
herd and the stables which they have occupied thoroughly dis- 
infected. 
4. When the newly developed sound herd has become of 
sufficient size the tuberculous herd can be eliminated by slaughter 
under inspection for beef. 
GROUP II. 
1. The reacting animals should be separated from the non- 
reacting ones and kept constantly apart from them at pasture, 
in yard and in stable. : 
(a) Pasture. The reactors should be kept in a separate 
pasture. This pasture should be some distance from the other 
or so fenced that it will be impossible for the infected and non- 
infected animals to get their heads together. 
