648 



NUTRITION OF FARM ANIMALS 



TABLE 190. METABOLIZABLE ENERGY OF DIGESTIBLE NUTRIENTS PER 



GRAM 



Protein (N X 6.25) : 



From wheat gluten . . ' . . . 



From wheat gluten (N X 5.7) . . 



From beet molasses 



From mixed grain 



From mixed ration of oats, hay 

 and straw 



From meadow riay 



From timothy hay 



From straw 



Fat: 



From peanut oil 



From hay (ether extract) . . . 

 Carbohydrates : 



Starch, Kellner's experiments . . 



Starch, Kiihn's experiments . . 



Nitrogen-free extract (assumed) . 



Crude fiber, of straw pulp . . . 



Crude fiber, of hay fed alone . . 



Crude fiber, of hay added to basal 

 ration 



Crude fiber, of oat straw . . . 



Crude fiber, of wheat straw . . . 



Crude fiber, of mixed ration . . 



CATTLE 



Cals. 

 4.894 



3.984 



1.272 



8.821 

 8.322 



3.648 



3.606 

 3-3II 



3.606 



3-437 

 3.001 



HORSE 



SWINE 



Cals. j Cals. 







3.228 



4.185 



3-523 



4.083 



753. Computation of metabolizable energy from digestible 

 organic matter. A more simple and direct method of compu- 

 tation may, however, be employed, based on the total digest- 

 ible organic matter of the ration. As already pointed out, 

 the differences shown in Table 188 between the percentages of 

 the gross energy of different feeding stuffs which are metabo- 

 lizable are due chiefly to differences in the proportion of the 

 chemical energy carried off in the feces, while the losses in urine 

 and methane are far more uniform. Accordingly, the metabo- 

 lizable energy per unit of digestible organic matter necessarily 

 exhibits much smaller variations than that per unit of dry 

 matter, and in fact shows a striking degree of uniformity. 

 Selecting those averages which appear most trustworthy, the 

 results may be summarized as follows : 



