40 PROFITABLE DAIRYING 



4. Do you know the "test" of each of your cows? 



5. If not, take samples of the milk of each and 

 test according to directions given. Great care should 

 be exercised in taking the sample. Follow directions 

 very carefully. If you do not happen to have a tester, 

 ask your butter or cheese maker to test the samples 

 for you or allow you to use his tester. 



6. Can you give four reasons why the fat column 

 in the neck of the milk test bottle may be light in color 

 or have curd underneath the fat column? 



7. Why do you read the extremes of the fat column 

 from the bottom of the fat column to the bottom of 

 the upper meniscus? 



LABORATORY PROBLEMS 

 V. To Test Sample of Milk by the Babcock Test 

 Obtain samples of milk and proceed as follows : 



a. Pour sample from one container to another sev- 

 eral times in order to thoroughly mix the milk. 



b. Immediately fill a 17.6 c.c. pipette to the mark 

 on the stem and transfer to a milk test bottle. 



c. Add 17.5 c.c. sulphuric acid and mix the same 

 by holding the bottle in an inclined position and whirl- 

 ing it horizontally. Whirl until all the acid is mixed 

 with the milk. 



d. Place in tester and whirl for five minutes. Be 

 sure that the tester is balanced. In case of an odd 

 number of bottles, fill one with water and balance 

 the tester with it. 



c. Pill the bottle to the neck with hot water to 

 which has been added a few drops of sulphuric acid; 

 whirl two minutes more. 



