ON MILK AND MILK-TESTING 1$ 



4. From diseased cows, . especially when the 

 udder is diseased. 



5. From the excreta of animals, which may 

 enter milk in small particles carrying disease-pro- 

 ducing bacteria. 



What causes milk to sour? 



The lactic acid bacteria change the milk sugar 

 into lactic acid, which is sour and as soon as suf- 

 ficient acid is formed the whole volume of milk 

 becomes sour to the taste. 



What are the causes of bad flavors in milk? 



1. Bacteria, which may enter milk in any of the 

 following ways: 



(o) From dust. 



(b) On dirt from the body of the cow. 



(c) From the atmosphere. 



(d) From hands, body, or clothing of persons 



handling milk. 



(e) From dirty utensils. 

 (/) From impure water. 

 (g) From diseased cows. 



2. Flavors absorbed when milk is exposed in 

 places where strong-smelling substances, such as 

 turnips and decayed vegetables, are kept. 



3. From strong-smelling foods eaten by the cow. 



4. Keeping milk at too warm a temperature. 

 When milk is warm, bacteria present grow rapidly, 

 and their action on the different constituents of 

 milk produces bad flavors. 



How should milk cans and utensils be washed? 

 They should be first rinsed with lukewarm 



