240 



NUTRITION OF FARM ANIMALS 



An interesting form of emission calorimeter is the so-called com- 

 pensation calorimeter, in which the heat produced by the subject is 

 balanced against that produced, for example, by burning pure hydro- 

 gen or by an electrical resistance in a precisely similar chamber. 

 Calorimeters of this type have been described by Haldane, 1 Bohr 2 

 and recently by Tangl. 3 



328. Summary. The foregoing facts may be summarized 

 in the following tabular statement showing the several items of 

 income and outgo of energy as well as the particular form of 

 energy contained in each. 



Income: 



Outgo : 



Feed 



Feces 



Urine 



Perspiration 



Combustible gases 



Work 



Heat 



Chemical energy 



Kinetic energy 

 Heat energy 



329. Example of an energy balance. The same experiment 

 upon a steer for which the nitrogen and carbon balance and 

 the metabolizable energy (290, 294, 322) have already been 

 computed may also serve to illustrate the determination of the 

 energy balance. In this experiment the animal performed no 

 external work, so that no energy had to be measured in that 

 form. 



TABLE 28. DAILY ENERGY BALANCE OF A STEER 



1 Jour. Physiol. (London), 16 (1894), 123. 



2 Skand. Arch. Physiol., 14 (1903), 398. 



8 Biochem. Ztschr., 53 (1913), 21. 



