Ash in Feeds 47 



The ash of the outside of the stem and of the husks 

 of seeds is in relatively large proportions, due sometimes 

 to an excess of silica. Husked rice kernels contain not 

 over .5 per cent of ash, while the husks contain 39 

 per cent or over. 



Influence of manufacturing processes on the ash con- 

 stituents. — The cattle food market is abundantly sup- 

 plied with the residues from certain manufacturing in- 

 dustries, such as milling, brewing and starch produc- 

 tion. The most prominent waste product is wheat 

 bran. As this is the outside of the kernel, we would 

 naturally expect, in view of the previous statements, 

 that it would be rich in mineral compounds, and we 

 find such to be the case. The wheat kernel contains 

 about 2 per cent of ash, wheat bran about 6 per 

 cent and wheat flour about .5 per cent. Bran may 

 become, therefore, an important source of mineral com- 

 pounds in the ration. In brewing, the kernels of barley 

 are subjected to a leaching process, which results in 

 taking out the soluble mineral salts, chiefly the salts of 

 the alkalies, potash and soda, leaving behind, in part, 

 the compounds of lime and magnesia. This fact is 

 made clear by comparing the analysis of the ash of 

 barley with that of brewer's grain: 



Partial composition of ash {per cent) 



Mag- Phos. 

 Potash Soda Lime nesia acid 



Summer barley 56 .06 .07 .23 .92 



Brewer's grains •• 15 . — .64 .45 1.69 



As a source of phosphoric acid and lime the brew- 

 .er's grains are more ^fiicient, pound for pound, than 



