16 



BULLETIN 687^ U. S. DEPARTMENT OF AGRICULTURE. 



the chemical and physical characteristics of charlock oil and state 

 that it can be refined sufficiently to be edible but that at present it is 

 largely used for industrial purposes. 



In view of its close resemblance to rape and mustard-seed oils, and 

 since a survey of the literature revealed no information in regard to 

 its digestibility, it seemed desirable to determine the digestibility of 

 this oil when eaten under conditions identical with those under 

 which the other fats have been studied. A good grade of unre- 

 fined commercial charlock-seed oil believed to be representative of 

 that ordinarily obtained by the consumer was purchased on the open 

 market for use in the tests. 



The following tables contain the results obtained during four test 

 periods : 



Data of digestion experiments tmtli charloelc oil in a simple mixed diet. 





Weight 

 of food. 





Constituents of foods. 





Experiments, subjects, and diet. 



Water. 



Pro- 

 tein. 



Fat. 



Carbohy- 

 drates. 



Ash. 



Experiment No. 641, subject A. F.: 



Blancmange containing charlock oil 



Grams. 



2,235.0 

 318.0 

 686.0 

 193.0 



Grams. 



1, 178. 5 



28.6 



596.1 



Grams. 

 57.2 

 33.7 

 5.5 



Grams. 



192.4 



4.8 



1.4 



Grams. 



795.0 



245.8 



79.6 



193.0 



Grams. 

 11 9 



Wheat biscuit 



5.1 



Fruit 



3.4 



Sugar 















Total food consumed 



3,432.0 

 85.0 



1, 803. 2 



96.4 

 24.6 

 71.8 



198.6 



12.5 



186.1 



1,313.4 



38.3 



1, 275. 1 



20.4 



Feces 



9.6 



Amoimt utilized 





10.8 











Per cent utilized 







74.5 



93.7 



97.1 



52.9 











Experiment No. 642, subject P. K.: 



Blancmange containing charlock oil 



2,082.0 

 342.0 

 276.0 

 102.0 



1,097.8 

 30.8 

 239.8 



53.3 



36.2 



2.2 



179.3 

 5.1 

 0.6 



740.6 

 264.4 

 32.0 

 102.0 



11.0 



Wheat biscuit 



5.5 



Fruit 



1.4 



Sugar 















Total food consumed 



2,802.0 

 65.0 



1,368.4 



91.7 

 20.1 

 71.6 



185.0 

 10.5 

 174.5 



1, 139. 



28.7 



1,110.3 



17.9 



Feces 



5.7 



Amount utilized 





12.2 











Per cent utilized 







78.1 



94.3 



97.5 



68.2 











Experiment No. 643, subject J. C. M.: 



Blancmange contaioing charlock oil 



1,916.0 

 309.0 

 369.0 

 154.0 



1,010.3 



27.8 

 320.7 



49.0 



32.8 



3.0 



165.0 

 4.6 

 0.7 



681.5 



238.9 



42.8 



154.0 



10.2 



Wheat biscuit .". 



4.9 



Fruit 



1.8 



Sugar 















Total food consumed 



2,748.0 

 72.0 



1,358.8 



84.8 

 18.5 

 66.3 



170.3 



6.3 



164.0 



1,117.2 



41.8 



1,075.4 



16.9 



Feces 



5.4 



Amount utiUzed 





11.5 











Per cent utiUzed 







78.2 



96.3 



96.3 



68.0 











Experiment No. 644, subject A. A. R.: 



Blancmange containing charlock oil 



1,809.0 

 284.0 

 871.0 

 252.0 



953.9 



25.6 



756.9 



46.3 



30.1 



7.0 



155.7 

 4.3 

 1.7 



643.5 

 219.6 

 101.0 

 252.0 



9.6 



Wheat biscuit 



4.5 



Fruit 



4.4 



Sugar 















Total food consumed 



3,216.0 

 96.0 



1,736.4 



83.4 

 29.1 

 54.3 



161.7 



9.5 



152.2 



1, 216. 



50.3 



1, 165. 7 



18.5 



Feces 



7.1 



Amount utilized 





11.4 











Per cent utilized 







65.1 



94.1 



95.9 



61.6 











Average food consumed per subject per day 



1,016.5 



522.2 



29.7 



59.6 



398.8 



6.1 



