THE COMPOSITION OF MILK 



value of milk for butter or cheese making purposes, 

 the yield in pounds as well as the percentage compo- 

 sition of the milk must be considered, as it frequently 

 happens that the cows giving the richest milk also 

 give the smallest yield of milk. 



10. Percentage Composition and Total Yields. In 

 order to determine the total yield in pounds of each 

 constituent produced by a cow or by a herd for a 

 given period, the total weight of milk is multiplied 

 by the percentage composition. In case it is desired 

 to compare the yields of milk solids of two cows, 

 giving respectively a total of 110 and 140 pounds of 

 milk in three days, an analysis would have to be 

 made of each milk. Suppose the milks give the 

 following results upon analysis : 



TOTAL YIELD OF MILK SOLIDS 



Cow No. 1 



Milk fats, 110 x .0406 = 4.47 

 Casein, 110 x. 0334= 3.67 

 Ash, 110 x. 007 = 0.77 



Sugar, 110 x .0504 = 5.54 

 Total 14.45 



Cow No. 2 



140 x. 0326= 4.56 

 140 x. 0354= 4.95 

 140 x. 0072= 1.01 

 140 x. 0504= 7.06 

 17.58 



