30 MARKET DAIRYING 
from cows affected with contagious diseases should be 
rigidly excluded from the dairy. Aside from the general 
unfitness of such milk there is danger of the disease pro- 
ducing organisms getting into the milk. It has been 
found, for example, that cows whose udders are affected 
with tuberculosis, yield milk containing these organisms. 
The prevalence of this disease among cows at present 
makes it imperative to determine definitely whether or 
not cows are affected with the disease, by the application 
of the tuberculin test. 
Any feverish condition of the cow tends to impart a 
feverish odor to the milk, which should therefore not be 
used. Especially important is it that milk from diseased 
udders, no matter what the character of the disease, be 
discarded. : 
Sanitary Barn. Light, ventilation and ease of clean- 
ing are essential to a sanitary dairy barn. The disinfect- 
ant action of an abundance of sunlight, secured by pro- 
viding a large number of windows, is of the highest im- 
portance. 
Of equal importance is a clean, pure atmosphere, secur- 
ed by a continuous ventilating system. The fact that 
odors of any description are absorbed by milk with great 
avidity, sufficiently emphasises the great need of pure air. 
To permit of easy cleaning, the barn floors and gutters 
should be built of concrete. They should be scrubbed 
daily, and care should be taken to keep the walls and 
ceiling free from dust and cobwebs. The feed boxes must 
also be cleaned after each feed. 
The stalls should be of the simplest construction, to 
afford as little chance for lodgement of dust as possible. 
Furthermore, they should so fit the cows as to cause the 
latter to stand with their hind feet on the edge of the gut- 
