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ILLINOIS DAIRYMEN'S ASSOCIATION. 261 



these nutrients. We will take, for example, a 1,000 pound cow 

 producing 30 pounds of 4 per cent milk and by referring to Table 

 1, find that she requires 2.1 pounds protein, 13.48 pounds carbo- 

 hydrates, and .58 of a pound fat. 



If one wishes to feed clover hay and corn and cob meal, he 

 can make up a trial ration by taking 15 pounds of clover hay and 

 8 pounds of corn and cob meal. The nutritive value of each of 

 these feeds can then be determined from feeding tables which give 

 the amount of digestible nutrients in 100 pounds of the different 

 feeds. We find that 100 pounds of clover hay contains 6.8 pounds 

 protein, 35.8 pounds carbohydrates, and 1.7 pounds fat. Dividing 

 each of these amounts by 100 we have the digestible nutrients m 

 one pound, multiplying by 15 we have the digestible nutrients in 

 15 pounds which is, 1.02 pounds protein, 5.37 pounds carbohy- 

 drates, and .25 of a pound fat. 



In the same manner are found the protein, carbohydrates, 

 and fat in 8 pounds of corn and cob meal. Taking the digestible 

 nutrients in the given amounts of each of these substances we have 

 the following ration : 



Ration A. 



Digestible Nutrients. 

 Carbohy- 



Protein. drates. Fat, 



Lb. lb. lb. lb. 



Clover hay 15 1.02 5.37 .25 



Corn and cob meal 8 .35 4.80 .23 



Total nutrients in ration 1.37 10.17 .48 



Nutrients required for a 1,000 lb. 



cow giving 30 lb. 4% milk 2.1 13.48 .58 



By comparing the total nutrients in this ration with the re- 

 quired nutrients for a cow producing 30 pounds of 4 per cent milk, 

 it is found that the ration is deficient in both protein and carbohy- 

 drates. To bring the nutrients up to the amount required we 

 try adding six pounds of bran and the ration is then as follows : 



