44 



Feeds and Feeding. 



changes made in the supply of protein in the food. Given a 

 supply of protein larger than is necessary to maintain the body 

 tissues, and there will in a few days be an equilibrium between 

 the supply and consumption of protein in the body, the time 

 varying with different animals and with the body condition of 

 each animal. The equilibrium will be reached sooner with a fat 

 animal than with a lean one, and sooner when the animal receives 

 food rich in protein and poor in fat than when the opposite occurs. 



III. Influence of Other Nutrients on Protein Consumption. 



66. Influence of fat. When fed alone, fat does not decrease 

 protein consumption in the body, as is shown in the following 

 results by Yoit with a starving dog: 1 



Feeding fat only, to a starving dog Voit. 



The influence of fat on protein consumption rather than 

 decreasing it seems to have increased it slightly. See also table 

 in Article 82. 



67. Influence of carbohydrates. When fed alone, carbohydrates 

 have no influence on the consumption of protein and thus act in 

 the same way as fat. The same amount of protein is decomposed 

 in the body when nothing but carbohydrates are fed as when no 

 food whatever is given. 



68. Influence of mixed diet. When the animal is fed on a 

 mixed diet containing fat, carbohydrates and protein, the con- 

 sumption of protein depends on the supply of protein in the food, 

 as in exclusive protein feeding. The following experiment 2 

 serves as an example: 



1 Zeitschr. f. Biologic, V, p. 329. Armsby, loc. cit., p. 136. 



2 Armsby, loc. cit., p. 137. 



