MANUAL OF CATTLE-FEEBma. 



237 



the work of the two former is tolerably constant, and 

 makes pretty imifonn demands on the latent energy sup- 

 plied by the food, while the labor performed by the di- 

 gestive apparatus is more variable, being relatively greater 

 with a bulky than with a concentrated fodder, and is like- 

 wise greater at or near the time of feeding than at other 

 ximes. 



Henneberg's Experiments. — ^We have already learned 

 that muscular exertion increases the excretion of carbonic 

 acid, but not notably that of urea, llenneberg * has shown 

 that the same is true of the work of the digestive organs, 

 so far, at least, as the excretion of carbonic acid is con- 

 cerned. 



In one series of respiration experiments on sheep the 

 animals were fed chiefly during the day, while in a second 

 series they received most of their fodder in the night. 

 The numbers in the following table give in grammes per 

 day the results obtained on two sheep taken together : 



Feeding chiefly by Day. 



Number of Exi-)en 



FoBDER (Hat). 



Carbonic Aoro. 



Of 100 Parts 

 Cahbonio Acid. 



menb 



Day. 

 Grms 



Kight 

 G-rms. 



Day. 

 Grms. 



Night, 

 Gnns, 



Day. 

 Per <«nt. 



Per cent. 



1 and 2 



3 and 4 .... . 



1,809 

 1,824 

 1,736 



624 



684 

 733 



877 

 777 

 864 



756 

 691 

 715 



54 



53 

 55 



46 



47 



5 and 6 



45 







Average 



1,790 



677 



839 



721 



54 



46 



* Neue Beitrige, etc, 1871, p. 157. 



