MILK BY-PRODUCTS 



111 



growing animals as one pound of farm grains. In 

 the handling, care, and use of whey, the same general 

 statements made in regard to skim milk will apply. 



101. Fertilizer Value of Milk By-products. — When 

 butter is sold from the farm, there is very little fer- 

 tility lost in the form of the principal plant food ele- 

 ments, — nitrogen, phosphorus, and potassium. The 

 butter fats are composed of the three elements, car- 

 bon, hydrogen, and oxygen. The nitrogen and the 

 ash or mineral elements are present in the skim milk 

 and buttermilk, and hence when butter is sold there 

 is practically no fertility lost. When cheese is sold, 

 part of the fertility is lost in the form of nitrogen, 

 which is present in the casein. In dairy farming, 

 the crop-producing power of the soil is not lessened, 

 provided the farm manure is judiciously cared for 

 and used. 



102. Comparative Value of Cow's Milk and the 

 Milk of Other Domestic Animals. — In order to com- 

 pare the general feeding value of cow's milk and 

 skim milk with the milk of other domestic animals, 

 the following table is given : — 



