THE BY-PRODUCTS OF RICE MILLING. 



13 



Table 13. — Yield of by-products and cleaned rice obtained from, the milling of 35,970 

 . pounds of No. 1 Honduras-type rice. Lot D. 



[Quantity of rice milled: 186 bags or 222 barrels of 162 pounds each; total weight, 35,970 pounds.] 



Cleaned rice and by-products. 



Hulls 



Brans: 



Stone reel (29.1 per cent) .. 



First break (34.3 per cent). 



Second break(36.6 per cent) 

 Polish 



Yield. 



Pounds. 

 7,532 



1,033 

 1,101 

 1,225 



Per cent. 

 20.9 



2.4 

 2.8 

 3.1 

 3.4 



Cleaned rice and by-products. 



Head rice 



Second-grade rice 

 Third-grade rice.. 



Brewer's rice 



Chicken feed 



Waste 



Yield. 



Pounds. 



15, 000 



5,000 



2,100 



960 



400 



741 



Per cent. 

 41.7 

 13.9 

 5.8 

 2.6 

 1.1 

 2.1 



The laboratory results on the samples from this run are shown in 

 Table 14. 



Table 14. — Chemical composition of by-products and of rice at different stages of milling 

 No. 1 Honduras-type rice. Lot D. 



Sample 

 No. 



Description of sample. 



Mois- 

 ture. 



Ash. 



Ash in- 

 soluble 



in 10 

 per cent 



HCl. 



Ratio 

 of insol- 

 uble ash 

 to total 

 ash. 



Crude 

 fiber. 



Pro- 

 tein 



(NX 

 6.25). 



Ether 

 extract. 



Nitro- 

 gen-free 

 extract. 



18051-L 





P. ct. 

 8.50 

 9.63 

 9.77 

 9.55 



9.65 

 7.93 



12.24 

 11.75 



11.57 



7.73 



11.74 



12.08 



11.75 



12.60 



12.70 



12.43 



11.41 



P. ct. 



20.33 

 15.75 

 7.26 

 6.94 



9.62 



7.05 



P.ct. 

 19.29 

 12.80 



.74 

 .77 



4.27 

 .52 



1: 1.05 

 1: 1.23 

 1: 9.81 

 1: 9.01 



1: 2.24 

 1:13.56 



P. ct. 



37.24 



22.14 



7.60 



5.92 



11.22 

 2.19 



P. ct. 



2.09 



9.36 



15.99 



14.93 



13.67 

 13.45 



P.ct. 

 0.50 

 6.51 

 18.38 

 15.75 



13.96 

 13.48 



P. ct. 

 31.34 



12698-L 





36.61 



18056-L 



18058-L 



( 



First-break bran 



Second-break bran 



Calculated analysis of 



41.00 

 46.91 



41.88 



18060-L 





55.90 



18052-L 



Rough rice before mill- 





12697-L 



Cleaned rough rice 



Rice, bran, and hulls 

















12699-L 

















12700-L 



Hulls and bran from 

















12696-L 



Rice from monitor going 

















18053-L 



Rice from clean side of 

 paddy machine 



Rice from rough side of 

 paddy machine 



Rice after first-break 

















18054-L 

















18055-L 

















18057-L 



Rice after second-break 

















18059-L 



Rice after brush ma- 

















18059-L 



Rice after brush ma- 

 chine (finely ground ) . 



.33 



.03 



1:11.00 



.59 



9.71 



.54 



77.42 



INTERPRETATION OF RESULTS. 



CONTROL PRODUCTS. 



A few interesting comparisons may be made from the milling 

 results. The percentage of hulls from a given lot of rice varied from 

 18.7 per cent to 20.9 per 1 cent, the lowest figure being for lot C of 

 Japan-type rice and the highest figure for lot D, Honduras type. 

 The yield of useful rice by-products — that is, all the brans and the 

 polish — varied from 10 per cent for lot B to 11.7 per cent for lot D. 

 As lot B was very lightly milled, this variation would be expected. 



