THE FEEDING OF DAIRY COWS. 19 



1 part wheat bran 15 



1 part cottonseed meal 35 



1 part gluten feed . ^ 20 



3 3) 70 



23. 3 per cent protein. 



3 parts wheat bran (3X15) 45 



2 parts cottonseed meal (2X35) 70 



1 part gluten feed (1X20 )__ 20 



6 G) 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 mixture by the 

 average protein content as derived above. The mixture 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 carbohydrates, but, as already stated, 

 grains are purchased primarily for their protein content, as almost 

 invariably the carbohydrates 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 usualty a safe method to follow. 



SAMPLES OF GRAIN MIXTURES TO BE FED WITH VARIOUS ROUGHAGES. 



WITH LOW-PROTEIN ROUGHAGES. 



The following grain mixtures are adapted to be fed with rough- 

 ages of the low-protein class, such as corn silage, corn stover, timo- 

 thy, prairie, rowen, or millet hays, cottonseed hulls, etc.: 



Mixture 1. 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. 



100 pounds cottonseed meal. 



100 pounds linseed meal (old process). 



200 pounds wheat bran. 

 Mixture 3. Per cent of digestible protein, 19.8 : 



300 pounds corn meal. 



200 pounds cottonseed meal. 



100 pounds dried distillers' grains (corn). 



100 pounds gluten feed. 



