EFFECTS OF TUBERCULIN ON TUBERCULOUS 



COWS.* 



F. L. Russell. 



A herd of ten cows and heifers that reacted to the tuberculin 

 test during the fall of 1895 and the following winter were placed 

 in quarantine in a stable built for them at considerable distance 

 from other buildings. The stable was light and well ventilated 

 and the cattle were well fed and cared for. In summer they 

 had the run of a small pasture with dry feed in the barn when 

 it was needed; in winter they were not confined in the barn, but 

 were turned out in a sunny yard during the middle of the day 

 when the weather was such that they could be comfortable out 

 of doors. Without using any elaborate or extraordinary means, 

 we endeavored to keep the animals under as healthful condi- 

 tions as possible. When placed in quarantine none of the 

 animals showed marked symptoms of being diseased, but on 

 the contrary, were about as thrifty and vigorous looking ani- 

 mals as could be found anywhere. They were considered 

 diseased simply because they reacted to the tuberculin test. A 

 thorough physical examination failed to reveal any symptoms 

 of disease aside from a slight cough in the case of two or three 

 of them, and these did not cough any more than many other 

 cows that were free from tuberculosis. In October, 1897, the 

 last of these animals was killed and we now make our final 

 report upon them, having made a partial report in the Annual 

 Report of this Station for 1896. Besides the ten animals with 

 which we started, we fed calves and pigs on the milk of these 

 cows and some of these became diseased. 



The table gives the result of all tests applied to the ten cows 

 and heifers composing the quarantined herd. 



*See Annual Report of this Station, 1S0G, pp. 56-63. 



