36 Report oF DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
ceding day. In order to avoid error several initial temperatures 
should be taken. In practice, veterinarians usually take only a single 
temperature to determine if the cow is not suffering from a fever, 
due perhaps to other causes. The reaction in such cases is deter- 
mined by the temperature curve. This procedure is liable to give 
erroneous results. The elevation of temperature should come on 
gradually, remaining practically at its maximum for a few hours 
and gradually subside. Erratic elevations of short duration are to 
be excluded. In cases of doubt the animal should be retested. 
6. Animals advanced in pregnancy and those known to be suf- 
fering from any disease should be excluded. All methods of treat- 
ment, including exposure to cold or kind of food or drink which 
would tend to modify the temperature should be avoided. Ani- 
mals in which tuberculosis is far advanced are said sometimes to 
fail to react.18 
7. The dose of tuberculin should vary to correspond to the 
weight of the animal. The dose for an adult cow of average 
weight is 0.25 cc. of the concentrated Koch tuberculin. This 
should be diluted to 2 cc. with a weak (1 per ct.) solution of car- 
bolic acid before injecting. The tuberculin prepared at the New 
York State Veterinary College is ready to inject when it is sent 
out. In cases where a second test is made within a few days the 
quantity of tuberculin injected should be larger than for the first 
test. 
The interpretation of the temperature record requires care. If, 
however, all conditions pertaining to the protection of the animal 
have been fulfilled, the temperature curve mentioned is a very sure 
indication that the animal is suffering from an active, although it 
may be a very small, tubercular growth. If there is no reaction 
the correct interpretation is more difficult. In this case there are 
three conditions which must be taken into account, namely: (1) If 
the animal is extensively diseased it may not react. In this case 
the physical condition would show that the animal was at least not 
healthy. (2) If the test was made during the period of incuba- — 
*% Such a case has not come under our immediate observation. Aurora 
gave a decided reaction when her body was literally filled with tuberculous 
tissues. See page 47. 
