440 MAIfUAL OF CATTLE-FEEDI^^O. 



of its body than is the case with mature animals. Com- 

 bining this with the rehitively Lxrger amount of food 

 eaten, we can readily miderstand the rapid increase in 

 weight of young anhnals. 



Production of Fat.— By means of a respiration appa- 

 ratus, the excretion of carbonic acid in these experiments 

 w^as determined. The following table gives the result per 

 day for the average animal of 100 lbs. weiglit, and also a 

 comparison with the amount excreted per 100 lbs. body- 

 weight by other animals : 



Calf 1.95 lbs. 



Man 1.3—1.4 



Dog (in hunger) 1.1 



"■ (weUfed) 1.8 



Ox (maintenance fodder) 1.0 



Ox (fattening) 1.3 



Sheep (maintenance fodder) 1.7 



The excretion of carbonic acid is, in general, relatively 

 greater in the calf than in mature herbivora, and ap- 

 proaches that of the well-fed carnivora. 



Tlie gain of carbon and consetpiently of fat per day was 

 also considerable. 



Carbon per 100 i^bs. live- weight. 



In food 0.98 lbs. 



Excreted , 0,53 '* 



Oain 0.45 '' 



Contained in the protein gained 0.18 *' 



Gained as fat 0.27 *' 



Corresponding to fat JJ5 *' 



Fat in the food 0.47 *' 



The amount of fat in the food was sufficient to supply 

 all that was gained. 



