320 ILLINOIS DAIRYMEN'S ASSOCIATION. 



produce on liberal feeding the required nutrients may be de- 

 termined. The next step is to select such feeds as will best supply 

 these nutrients. We will take, for example, a 1000-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 

 carbohydrates 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 found from the table which gives 

 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 digest- 

 ible nutrients in one pound, multiplying by 15 we have the di- 

 gestible nutriments in 15 pounds, which are 1.02 pounds protein, 

 5.37 pounds carbohydrates 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, and taking the total digestible nutrients in 

 the given amounts of each of these substances we have the fol- 

 lowing trial ration : 



Ration A. 



Digestible Nutrients. 

 Carbohy- 



Protein, drates, Fat, 

 Lb. lb. lb. lb. 



Cllover 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 giv- 

 ing 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 

 carbohydrates. To bring the nutrients up to the amount required 



