FEED FOR THE COW 149 



How to use the Haecker standard. In prac- 

 tical feeding an allowance of .7 pounds digestible 

 protein, 7 pounds digestible carbohydrates, and .1 

 pound ether extract per 1,000 pounds of live 

 weight will suffice. 



To the maintenance ration there should be 

 added an amount of feed sufficient to produce 

 the amount of milk which the cow is capable 

 of yielding. Haecker has shown that this varies 

 with the richness of the milk as well as with its 

 quantity. An examination of the following table 

 makes this apparent. 



TABLE IV 



Showing feed required for the production of 10 pounds of 

 milk of varying richness 



Per Cent Fat in Milk Protein Carbohydrates Ether Extract 



From the above table it is easily possible to 

 calculate the amount of feed required by a cow 

 of any given size to produce a given quantity of 

 milk of any richness. 



Feeding' rules. Haecker 's standards have been 

 still further simplified for practical use by put- 

 ting them in the form of the following rules for 

 feeding grain and roughage: 



