ILLINOIS STATE DAIRYMEN'S ASSOCIATION. 133 



stroying bacteria in milk, areating with ice before it is' used? 



A. There is a distinction between areating and cooling, they are two 

 different things. The areating simply removes odor from the milk and 

 that has nothing to do with bacteria, while the cooling checks and pre- 

 vents the growth of bacteria. Odors are caused from two different things, 

 but chiefly from the food the cow eats. In that case areating is very essen- 

 tial and lemoves the odor to some extent, but if you can get an odor com- 

 ing from bacteria, the bacteria in milk, then areating in that case would 

 do no good. Areating simply means exposing the milk to the air in some 

 form or other, that has no effect upon the bacteria. 



Q, The point I made was, we use an areator of the modern style 

 filled with crushed ice and cold wa ter and a cool surface lor the milk to 

 flow over. 



A. What do you mean, whether milk will keep longer? 



Q. Well, take milk for instance that is not areated! and cooled and 

 left in the room to cool, and then to cool it instanter? 



A. It will keep much longer of course in that case because of the cool- 

 ing. The number of bacteria in that milk will grow in a warm tempera- 

 ture much quicker. If cooled immediately the bacteria will be checked to 

 a great extent. 



Mr. President: Is it not a fact milk will keep much longer when 

 areated and not cooled by getting the animal heat out of it? 



A. Yes, so far as you get the animal heat out. I never have seen 

 milk simply areated. They get the two mixed, areated and cooled. As 

 to whether milk would! keep longer by simply areating, I doubt if it would. 

 If it wasn't areated there would be the odor from the cow if she was fed 

 on barn feeding. It would have the same smell and I doubt if it would 

 keep longer, but as a usual thing we do not areate without cooling. The 

 temperature of the air is usually not just right. We ran the areator until 

 the temperature is up to 75 deg. if it is pretty warm weather. 



Q. Our temperature is 110 deg. in the room. 



A. I don't see why it would be. I don't see why when you areate milk 

 at 110 deg. it dones't cool. 



Mr. Newman: Don't you think pure ozone is just as good for milk as 

 for human beings? I believe that practical work has been done in the 

 north. They areate without cooling, and that is much better than coolins: 

 without areating. 



