CATTLE PRODUCTS 



327 



The barn should be properly ventilated to remove bad 

 odors, bad air, dust particles, and bacteria. The ventilation 

 must be ample and yet free from drafts of air. There are 

 two good systems in use. One consists of muslin cloth 

 screens placed in several of the open windows. The other 

 is the King ventilation system, which draws the foul air out 

 from near the floor, through a long shaft or chimney (Fig. 

 215). This is the best system for winter ventilation of build- 

 ings. 



Fig. 214. — A small but clean dairy bam. (Animal Industry.) 



The cows must be clean if pure milk is to be produced for 

 food. Milk always becomes dirty if the cows are dirty. 

 The udders and surrounding parts should be washed if 

 filthy; and the dust and loose hairs must be removed just 

 before milking, by the use of a damp cloth. 



The milker must be healthy, and must have clean hands 

 and clean clothes. 



Milk pails should have small tops because they catch 

 less dirt. The pails with good hoods shown in Fig. 216 will 

 keep out the most dirt. 



All milk utensils must be washed well and then always 



