6 
Farmers’ Bulletin 1009. 
In some localities in the West, where dairying has developed 
extensively, it is now known that carload lots of cows purchased in 
other States have contained 50 per cent or more of tuberculous 
animals. Some herds of beef cattle in our western country have 
become contaminated with the disease by placing among them 
tuberculous pure-bred bulls and cows that came from diseased herds 
elsewhere. The importance of controlling tuberculosis and prevent¬ 
ing its spread by the interstate movement of diseased animals was 
not so well recognized during the times of pioneer development as 
it is to-day. Consequently in the absence of regulations and inspec¬ 
tion, diseased animals moved from one State to another. The ship¬ 
ment of cattle from Eastern and Northern States to the South, with 
the exception of dairy herds near the larger cities, did not commence 
until progress had been made in the eradication of the cattle tick. 
Therefore there is probably less tuberculosis among the herds of the 
Southern States than in any other part of the Nat ion. This favorable 
condition should be taken advantage of, for in all probability the 
live-stock industry will reach a high development in that area in 
future years. It is especially important that the herds of the Southern 
States be protected by permitting only tuberculosis-free animals 
to enter. 
Fig. 2 .—An insanitary bam. Nearly all the cows kept in il were tuberculous. The stone foundation 
wall retains about 2 feet of liquid manure which contains millions of tubercle germs. Premises of this 
character can not be kept sanitary. 
