116 



Feeds and Feeding. 



ished if the other be correspondingly increased. If our theories 

 are correct, the important matter is to provide sufficient protein 

 and sufficient total energy without varying too much from the 

 most desirable relative proportions of the fats and carbohydrates.' > 

 The Calories in the second trial ration for the dairy cow 

 reported under Article 136 are determined in the following 

 manner: The digestible protein and digestible carbohydrates of 

 the ration are added together and the sum is multiplied by 1,860, 

 the fuel value of one pound of these nutrients. In the same 

 manner the ether extract is multiplied by 4,240, its fuel value. 

 The calculations are as follows: 



In ration. 



Arranging the digestible nutrients and Calories for the standard 

 ration for the cow when giving 22 pounds of milk daily, and for 

 the second trial ration for the dairy cow as calculated above, the 

 following table is derived: 



By the table we learn that the digestible nutrients in the stand- 

 ard ration for the cow when giving 22 pounds of milk daily, 

 would, on combustion, yield 30,950 Calories, while the second 

 trial ration given in Article 136 yields 33,420 Calories, an excess 

 above the standard of nearly 10 per cent. 



