222 DAIRY FARMING 



Reducing Cream with Skim=milk. When a definite 

 quantity of standardized cream is called for, determine 

 first the amount of original cream (cream as it leaves -the 

 separator) required according to the following rule: 



Rule : Multiply the number of pounds of standardized 

 cream called for by its test and divide the product by the 

 test of the original cream. 



The difference between the amounts of original and 

 standardized cream represents the amount of skim-milk 

 required. 



Problem: How many pounds each of 45% cream and 

 skim-milk (zero test) are required to make 60 pounds of 

 iS% cream? 



Applying the above rule we get, 



(60 X 18) -f- 45 = 24= No. Ibs. of original cream. 



60 24 = 36 =: No. Ibs. of skim-milk. 



Milk may be standardized in the same way. 



Mixing Two Milks or Two Creams, or Milk and 

 Cream, of Different Richness. In the preceding two 

 formulas the test of the skim-milk was considered zero. 

 When milks or creams of different tests are mixed the 

 calculation becomes more difficult. Pearson, however, 

 has devised a method by which calculations of this kind 

 are very much simplified. This method is as follows: 



Draw a rectangle with two diagonals, as shown below. 

 At the left hand corners place the tests of the milks or 

 creams to be mixed. In the center place the richness 



