456 MILK 



" : Group 1. Where 50 per cent, or more of the animals are in- 

 fected. 1. Eliminate by slaughter all animals giving evidence of 

 the disease on physical examination. 



"2. Build up an entirely new herd from the offspring. The 

 calves should be separated from their dams immediately after 

 birth and raised on pasteurized milk or on that of healthy 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 re- 

 acting 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 suf- 

 ficient size the tuberculous herd can be eliminated by slaughter 

 under inspection for beef. 



"Group 2. Herds where a small percentage (15 per cent, or 

 less) of the animals are affected. The procedure is as follows: 



"1. The reacting animals should be separated from non-react- 

 ing ones and kept constantly apart from them at pasture, in 

 yard, and 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. 



"(b) Water: When possible to provide otherwise, reacting 

 cattle should not be watered at running streams which afterward 

 flow directly through fields occupied by sound cattle. The water 

 from the drinking-trough used by infected animals should not be 

 allowed to flow into stables, fields, or yards occupied by sound 

 animals. 



"(c) Stable: Reacting cattle should be kept in barns or stables 

 entirely separate from the ones occupied by sound animals. 



"2. Calves of reacting cows should be removed from their dams 

 immediately after birth. Milk fed these calves must be from 

 healthy cows; otherwise it must be properly pasteurized. These 

 calves should not come in contact in any way with reacting 

 animals. 



"3. The non-reacting animals should be tested with tuberculin 

 in six months, and when reactors are found at the first six months' 

 or any subsequent test the others should be retested not more 

 than six months later. When there are no more reactors at the 



