218 A FEEDERS' GUIDE. 



Table XVI. Classification of Cattle Foods. A. Coarse Feeds. 



i 

 Low in protein. Medium in protein. Low in protein. 



High in carbo- Medium in carbo- High in carbo- 



hydrates, hydrates. hydrates. 



50 to 65 per cent. 55 to 65 per cent. 85 to 95 per cent, 

 digestible. digestible. digestible. 



B. Concentrates. 



The Feed Unit System. 



This system furnishes a convenient and accurate method of 

 comparing the feed consumption of different farm animals and of 

 determining the relative economy of their production. It has been 

 found, for example in the case of dairy cows, that some cows 

 produce a certain amount of milk and butter-fat much more 

 cheaply than others, so far as their feed consumption is con- 



