180 PROFITABLE DAIRYING 



LABORATORY PROBLEMS 



XXIV. To Determine the Lactometer Readings and Fat 

 Content of Milk That Has Been Watered and Skimmed 



1. Take samples that have been partially skimmed 

 and add small quantities of water until the lactometer 

 readings are approximately the same as those of the 

 original sample. 



2. Determine the fat content of these three lots of 

 milk after they have been watered. 



3. Judging from the results obtained, is it sufficient 

 to take the lactometer reading only in order to deter- 

 mine whether or not a certain milk has been either 

 watered or skimmed? 



Note: The following may assist the student: 



a. Normal per cent of fat (3.00 to 5.00 per cent) and a 

 normal reading (29.0 to 33.0) indicate normal milk. 



b. Below normal in fat and high in lactometer reading 

 (above 33.0) indicate skimming. 



c. Below normal in fat and low lactometer reading (below 

 29.0) indicate watering. 



d. Below normal in fat and normal lactometer reading 

 (29.0 to 33.0) indicate both skimming and watering. 



