672 NUTRITION OF FARM ANIMALS 



from it. For example, the net energy values of alfalfa hay and 

 of wheat bran having the composition and digestibility given 

 by Allen 1 would be computed as follows : 



TABLE 209. COMPUTATION OF NET ENERGY VALUES PER 100 POUNDS 

 ACCORDING TO KELLNER 



Alfalfa Hay 



Digestible protein 10.58 X 1.016 = 10.75 Therms 



Digestible carbohydrates 37-33 X 1.071 = 39.98 Therms 



Digestible ether extract 1.38 X 2.041 = 2.82 Therms 



53.55 Therms 



Total crude fiber 25.00 X 0.617 = 15.43 Therms 



Net energy value 38.12 Therms 



Wheat Bran (Relative Value 77 %) 



Digestible protein 12.01 X 1.016 =12. 20 Therms 



Digestible carbohydrates 41.23 X 1.071 = 44.16 Therms 



Digestible ether extract 2.87 X 2.273 = 6.52 Therms 



62.88 Therms 

 Net energy value 62.88 X 0.77 = 48.42 Therms 



772. Starch values. Kellner's results were in reality net 

 energy values, as is evident from the method by which they 

 were obtained. In order, however, to avoid the use of the 

 large numbers required to express the net energy values of 

 rations in Calories, and also to avoid the introduction of un- 

 familiar terms, he converted them for practical use into what he 

 called " starch values." The starch value of a feeding stuff 

 may be briefly defined as the amount of pure starch (assumed to 

 be perfectly digested) which has the same net energy value. 

 Thus, Kellner's table gives the starch value of maize meal as 

 1.5 kilograms per 100 kilograms, or 81.5 pounds per 100 pounds. 

 One pound of starch, according to Kellner's results (769), has a 

 net energy value of 1071 Cals. The starch value of 81.5 given 

 for maize meal, therefore, is equivalent to a net energy value 

 of 1071 X 81.5 = 87,286 Cals., or 87.29 Therms, per 100 pounds 

 and conversely the starch values of the alfalfa hay and wheat 

 bran of the previous paragraph would be 35.59 and 45.21, re- 

 spectively. 2 



1 U. S. Dept. Agr., Farmers' Bulletin 22 (Rev.), 1901, pp. &-g. 



2 In other words, Kellner's starch values multiplied by 1.071 = net energy 

 values per 100 Ib. 



