
TUBERCULOUS COWS AND USE OF THEIR MILK. 165 
1899, this calf was fed the milk of cow No. 1343. In October 
it was weaned, and was fed a hay and grain ration until it was 
killed, February 12, 1900. Post-mortem examination showed 
one posterior mediastinal gland affected with encysted tuber- 
cular material. As far as could be found there was no active 
tuberculosis present in the system. 
Feeding Calf K with the milk of Cow 1343.—Calf K was 
dropped by cow No. 1343, December 23, 1899. From birth 
till May 26, 1900, this calf was kept in the second story of the 
barn, above the cows, in a room closed from the rest of the 
barn. It was thought that the animal was under conditions 
of thorough quarantine from the other animals in the barn. 
It was fed the normal milk of its dam for nearly three months 
before being tested. Calf K was tested with tuberculin March 
19-20, 1900, and gave a marked response. 
In order to test the question as to whether the transmission 
of the disease has probably taken place through the milk or by 
association with the cows, some new feeding tests are being 
planned for the summer and fall of 1900. In these tests the 
calves will be kept at pasture, entirely separate from all other 
animals, and the milk of the tuberculous cows will be carried 
to them. 
SUMMARY OF FEEDING TESTS. 
Within the first two years that the tuberculous cows were under 
experiment one secondary case of tuberculosis developed. This case 
was discovered about twenty-five months after the cows came to the 
Station. During this time four animals, A, B, C, and D, were 
fed the milk of the cows in periods ranging from eighteen months 
to twelve months. Throughout the whole of this time, except the 
five months while steers A and B were at pasture, the young 
animals were closely associated with the cows. As has already 
been shown, there was good reason for the belief that the disease 
was present in its earlier stages when the cows came to the Station. 
The first two years experience then would seem to show that when 
the disease exists in the cow in tts earlier stages the chances for 
its transmission, either by the milk or by other means, to calves 
associated with the cows are quite limited. 
The balance of the time that the cows have been at the Station, 
which includes the period from about two years to three and 
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