280 AGRICULTURE FOR COMMON SCHOOLS 



this point may be called home-grown feeds, since they can all 

 be produced on the farm. 7. Under the heading of waste 

 products there is given a long list of products which are left in 

 the manufacture of certain commercial products. For this 

 reason they are often called by-products. For example, the 

 gluten meals and gluten feeds are the waste products in the 

 manufacture of glucose from corn, and brewers' grains and 

 distillery grains come from the large breweries where alcoholic 

 liquors are made. It will be noticed that nearly all of these 

 feeds are high in dry matter and quite rich in protein and fat. 

 The waste products are the group of commercial concen- 

 trates. Nearly all are high-priced feeds owing very largely 

 to their protein content. This group is often called the sup- 

 plementary feeds, because they are used to fill out and bal- 

 ance the home-grown feeds. 8. Milk and its products may 

 be considered a home-produced group. While the dry matter 

 and food elements in the group are quite low, yet every farmer 

 and feeder knows their great value for feeding to swine. 



