162 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



milk. For a cow weighing more than this , sufficient feed 

 must be added to supply .07 pounds protein and .72 pounds car- 

 bohydrate and fat for every 100 pounds the animal weighs above 

 the iooo pounds. 



Table No. 2. Digestible Nutrients Required Per Day by a 1,000-Pound 

 Cow Giving Different Amounts of Milk. 



Protein 



10 lb. Milk testing 3 per cent fat 1.23 



20 lb. Milk testing 3 per cent fat 1.61 



30 lb. Milk testing 3 per cent fat 2.03 



40 lb. Milk testing 3 per cent fat 2.43 



50 lb. Milk testing 3 per cent fat. .... .2.88 



60 lb. Milk testing 3 per cent fat 3.28 



10 lb. Milk testing 4 per cent fat 1.25 



20 lb. Milk testing 4 per cent fat 1.77 



30 lb. Milk testing 4 per cent fat. 2.30 



40 lb. Milk testing 4 per cent fat 2.80 



50 lb. Milk testing 4 per cent fat 3.33 



60 lb. Milk testing 4 per cent fat 3.80 



10 lb. Milk testing 5 per cent fat 1.33 



20 lb. Milk testing 5 per cent fat 2.00 



30 lb. Milk testing 5 per cent fat 2.55 



40 lb. Milk testing 5 per cent fat 3.10 



50 lb. Milk testing 5 per cent fat 3.70 



60 lb. Milk testing 5 per cent fat 4.32 



As previously stated, it has been the custom in this work to 

 consider three groups of nutrients, the protein, carbohydrate and 

 fat. Since carbohydrate and fat answer the same purpose and 

 neither is seriously lacking in our common feeds, they will be 

 considered together here, leaving only two groups, protein and 

 carbohydrate pins the fat. The point in balancing a ration is 

 to get just the right amount of protein to go with the carbohy- 

 drate and fat. This relation is called the nutritive ratio, or the 

 ratio of protein to carbohydrate and fat. 



To make up a balanced ration proceed as follows : Suppose 

 the cow weighs 1200 pounds and gives 30 pounds of milk, test- 

 ing 4 per cent butter fat. Table 2 shows that a 1000-pound cow 



ounas 



Carbohydrate 



Nutritive 



and fat 



ratio 



9.35 



1 



to 7.6 



11.45 



1 



to 7.1 



13.58 



1 



to 6.7 



15.58 



1 



to 6.4 



17.80 



1 



to 6.1 



19.93 



1 



to 6.0 



9.74 



1 



to 7.8 



12.26 



1 



to 6.9 



14.78 



1 



to 6.5 



17.31 



1 



to 6.2 



19.82 



1 



to 6.0 



22.37 



1 



to 5.8 



10.16 



1 



to 7.6 



13.08 



1 



to 6.8 



16.31 



1 



to 6.4 



18.93 



1 



to 6.1 



21.87 



1 



to 5.9 



24.81 



1 



to 5.7 



