44 Report oF DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
The cattle were tested with tuberculin twice each year in order 
that any cases of disease which might develop might be detected 
before it had spread to other animals. May and November were 
preferred for making the test, but the exact time was determined 
partly by convenience and partly by a desire to avoid testing cows 
in an advanced state of pregnancy. Cows were usually omitted 
from the test when within six weeks of the date when they were 
due to calve. Strictly speaking, no purchased animal should have 
been admitted to the sound herd until it had been tested with tuber- 
‘culin and failed to react. For lack of a convenient place for hold- 
ing such animals in quarantine they were usually placed in the 
sound herd and tested within a few weeks. In a number of cases 
they were found to be tuberculous, and accordingly for a time 
had exposed the herd to serious danger. 
Animals reacting to tuberculin were at once removed to the other 
herd and were considered as tuberculous after that time, no mat- 
ter what reaction they gave later. There may be exceptions to the 
rule that an animal once tuberculous always remains so, but in the 
present state of our knowledge the only safe course lies in ob- 
serving it. 
In the diseased herd.— The cattle were given the same care as 
to their feed and general condition that was bestowed upon the 
sound herd. It was often a matter of comment by persons who 
inspected both herds at different times during the progress of the 
work of the diseased herd, so far as physical appearance went, 
was fully the equal of the sound one. 
The cattle were tested with tuberculin at least once a year and 
in most cases twice. This was done for the purpose of scientific 
study rather than with any idea of returning them to the sound 
herd. 
Whenever any of the animals were found to be unsatisfactory 
for breeding purposes and were in good condition they were sold 
for beef. 
When any of the animals began to show signs of breaking down 
due to the disease they were killed and buried. This was done 
because their usefulness was about at an end and to have kept 
them longer would have needlessly exposed their companions and 
have increased the danger to the sound herd. For this reason 
Cows No. 4 and No. 10 were killed in November, 1gor. 
