COOPERATIVE BULL ASSOCIATIONS. 
35 
to advantage, when there is time to raise them to breeding age before 
their services are needed. 
In buying bulls special care should be taken to see that the ani¬ 
mals chosen are healthy and especially that they are free from the in¬ 
fection of either tuberculosis or contagious abortion. If possible 
the bulls should be purchased from herds accredited by the Bureau 
of Animal Industry as being free from tuberculosis. A list of such 
herds may be obtained from the bureau. If it is impossible to buy 
from an accredited herd purchase from a breeder who will furnish 
satisfactory evidence that the animals have passed the tuberculin test 
and have never reacted to that test. 
9 
