12 QUESTIONS AND ANSWERS 



2. Those that produce gas and bad flavors in 

 milk, called putrefactive bacteria. 



3. Those that produce disease called pathogenic 

 bacteria. 



4. Specific bacteria, such as those producing 

 blue milk, bitter milk, ropy milk, etc. 



How do bacteria gain entrance to milk? 



1. From the air. The purity of the air deter- 

 mines the number and character of the bacteria. 

 The air in unclean stables contains many bacteria. 



2. From dirt or dust. All dirt and all dust carry 

 many bacteria, mostly of the putrefactive type. 



3. From the hands, clothing, or body of persons 

 that have or recently have had or are caring for 

 persons who have contagious or infectious diseases. 



4. From unclean utensils. 



5. From infected water supply. 



6. From diseased cows. 



What effects do bacteria produce in milk? 



1. Some forms sour milk. 



2. Some forms produce gas in milk. 



3. Some produce undesirable flavors. 



4. Some cause sweet coagulation. 



5. Some cause ropy milk. 



6. Some cause bitter milk. 



7. Some produce abnormal colors in milk. 



8. Some carry disease and render milk unfit for 

 consumption. 



How is the bacterial content of milk controlled? 



I. By absolute cleanliness in all things sur- 

 rounding the production and handling of the milk. 



