MANUAL OF OATTLE-FEEBIlfO. 



Temperature. 

 Deg. Gent. 



4.4 



6.5 



9.0 



14.3 



16.3 



Carbonic 

 acid. 

 Grras. 



Ureal 



nitrogen. 



Grms. 



210.7 



4.23 



206.0 



4.05 



192.0 



4.20 



155.1 



3.81 



158.3 



4.00 



Temperature. 

 Deg. Gent. 



23.7 

 24.2 

 26.7 

 30.0 



Ourbonfc 

 aCid. 

 Grms. 



164.8 



166.5 

 160.0 

 170.6 



Ureal 



nitrmwi. 



Gnus. 



3.40 

 3.34 

 3.97 



The increased excretion of carbonic acid in the cold as 

 compared witli an ordinary temperature of Itt"* to 15^ 0. 

 (about 60° F.) is as marked in tliese experiments as in tlie 

 preceding ones, but above that temperature a slightly in- 

 creased excretion was observed. The excretion of nitrogen 

 is seen to vary in the same way, though to a small extent, 

 indicating an increased protein consmnption as a result of 

 exposure to a low temperature. 



These results show plainly how great an influence the 

 temperature of its surroundings may have on the amount 

 of fodder required by animals, and confirm the conclusion 

 drawn from many practical experiments, that it is desirable 

 to protect animals from extreme cold. 



In conclusion, it should be said that the action of a low 

 temperature of the surrounding medium appears to be, in 

 the first place, on the nerves, and that only through tliem 

 does it cause a greater activity of the chemical processes in 

 the body and an increased production of heat. 



It has been shown by Pfliiger that when this action of 

 the nerves is hindered, the activity of chemical change in 

 the body is increased by heat and decreased by cold, just 

 as many chemical processes outside the body are, and as is 

 the case normally in cold-blooded animals. 



