98 HATCH EXPERIMENT STATION. [Jaiu 



The corn by-products (gluten feed and distillers grains) con- 

 tain only a trace of potash. The money valuations are 

 based on current market prices, namely: nitrogen, 18.5 

 cents; potash, 4.25 cents: and phosphoric acid, 4 cents a 

 pound. The fertilizing elements in the several feeds are in 

 as desirable a form as those in the best grades of unmixed 

 fertilizinor stock. Bran is shown to contain fertilizer inffre- 

 dients equal to 54 per cent, of its cost, and cotton-seed meal 

 is fully equal to its cost ; the others are considerably in ex- 

 cess of the bran. 



It is not to be inferred that after the several feeds have 

 passed through the animal their fertilizing ingredients have 

 as high a money value as before they were consumed. In 

 fact, some 20 per cent, has been retained by the animal, 

 more or less loss has unavoidably occurred in the manurial 

 residue, and they are in a nuich more bulky condition, which 

 requires considerable additional lal)or to apply them. Nev- 

 ertheless, the figures show clearly that the combined ferti- 

 lizer ingredients in bran have noticeably less value than in 

 any of the other by-products. 



Conclusions. 



1. Wheat bran contains noticeably less total as well as 

 less digestible protein than any of the other nitrogenous by- 

 products. 



2. The total digestible matter in bran is likewise less than 

 in the other prominent concentrates ; thus, cotton-seed meal 

 contains 24 per cent, more, gluten feed 44 per cent., distil- 

 lers' grains 21 per cent, and corn meal 38 per cent. 



3. For several years j)ast the cost of a pound of digestible 

 matter in bran, cotton-seed meal, distillers' and brewers' 

 dri<'d grains has been about the same ; it could be purchased 

 in the form of gluten feed, corn and hominy meals for some 

 20 per cent. less. 



4. A pound of digestible protein in wheat bran cost 100 

 per cent, more than in cotton-seed meal, 80 per cent, more 

 than in gluten feed and 50 per cent, more than in distillers' 

 dried grains. 



5. Because of its relatively low protein percentage, the 



