252 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



3 parts wheat bran (3X15) 45 



2 parts cottonseed meal (2X35) 70 



1 part gluten feed (1X20) 20 



6) 135 



22.5 per cent protein 



The approximate price of a ration per pound of protein 

 may be ascertained as follows : Divide the total price of the mix- 

 ture by the average protein content as derived above. The mix- 

 ture costing the smallest price per pound of protein, other things 

 being equal, is the most economical. Unfortunately, other things 

 are never exactly equal, for the physiological effect of the grain, 

 bulk, and palatability must also be taken intO' consideration. 

 Practically all the grain feeds low in protein are rich in car- 

 bohydrates, but, as already stated, grains are purchased pri- 

 marily for their protein content, as almost invariably the carbohy- 

 drates can be produced more cheaply in the form of corn silage, 

 cornstalks, etc. While the above-mentioned method of testing 

 the economy of a grain ration is not entirely accurate, it is usu^ 

 ally a safe method to follow. 



Samples of Grain Mixtures To Be Fed Witli Various Roughages. 

 With Low-Protein Roughages. 



The following grain mixtures are adapted to be fed with 

 roughage of the low-protein class, such as corn silage, corn 

 stover, timothy, prairie, rowen, or millet hays, cottonseed hulls, 

 etc. 



Mixture i. — Per cent of digestible protein, 18.4. 



500 pounds corn meal. 



400 pounds dried distillers' grains (corn). 



200 pounds gluten feed. 



300 pounds linseed meal (old process). 

 Mixture 2. — Per cent of digestible protein, 19.8. 



100 pounds corn meal. 



