FUNCTIONS OF THE NUTRIENTS 



179 



The values arrived at by Kellner are in the next table. 

 These differ, as would be expected, somewhat from the 

 values reached by Armsby and Fries because of a dif- 

 ference in the character of the materials fed. 



Table XL 



262. Computing net energy values of feeding-stuffs. — 

 It is very evident that it is not possible to make direct 

 determinations of the net energy values of all feeding- 

 stuffs, but these may be estimated with reasonable 

 accuracy. The following method of computing these 

 estimates may be followed, which is based on the total 

 digestible material, and the conclusion that each gram 

 of digestible organic matter contains 3.5 calories of 

 metabolizable energy. The energy used for feed con- 

 sumption is reduced to the percentage of dry matter in 

 the three feeds entering into the computation shown in 

 Table XLI. 



