322 ILLINOIS DAIRYMEN'S ASSOCIATION. 



milk, it is found that the ration is deficient in both protein and 

 carbohydrates, but needs larger proportion of protein than of 

 carbohydrates to bring the nutrients up to the amount required. 

 Adding one pound each of corn meal ground oats, and liseed meal, 

 we have ration D. which is a good economical ration and fulfills 

 the desired requirements. 



Ration D. 



Digestible Nutrients. 

 Carbohy- 

 Protein, drates, Fat, 

 Lb. lb. lb. lb. 



Clover hay 8 .54 2.86 .14 



Corn silage 40 .36 4.52 .28 



Corn meal 5 .39 3.34 .22 



Ground oats 5 .46 2.36 .21 



Linseed meal 1 .29 .33 .07 



Total nutrients in ration 2.04 13.41 .92 



Nutrients required for a 1,000- lb. cow giv- 

 ing 30 lb. 4% milk 2.10 13.48 .58 



Nutritive Ratio. 



Since protein on the one hand and carbohydrates and fat on 

 the other serve different functions in the body, the relative 

 amount of each should be carefully considered, and the ratio of 

 the protein to the carbohydrates, which is called the nutritive ratio 

 is determined in the following manner: The value of a pound of 

 fat in feeds has been found to be 2.4 times tthat of a pound of 

 carbohydrates, and as fat nourishes the body in the same way as 

 carbohydrates, the amount of fat is multiplied by 2.4 and added to 

 the carbohydrates; this sum divided by the amount of protein 

 gives the ratio of the protein to the carbohydrates, and is known 

 as the nutritive ratio. 



This may be illustrated by taking the total digestible nutri- 

 ents in trial ration C on page 321, which contains 1.58 pounds pro- 

 tein, 11.94 pounds carbohydrates, and .76 of a pound fat. 



.76 of a pound fatX 2.4=1.82. 



11.94 pounds carbohydrates+1.82=13.76. 



13.76-=-1.58 (amount of protein)=8.7. 



Since there are 8.7 times as much carbohydrates as protein 



