50 DAIRY LABORATORY GUIDE 



EXERCISE 2 



MIXING MILK AND ACID FOR TESTING 



Object : To determine the effect upon the reading of the 

 test from incomplete mixing of the milk and acid. 



Apparatus : Sample of milk, four whole-milk test bottles, 

 and testing outfit. 



Steps: 1. Number the bottles from 

 1 to 4. 



2. Mix the sample well and measure 

 17.5 c. c. into each bottle. 



3. Add a measure of acid to each 

 bottle. 



4. Mix numbers 1 and 2 well until 

 all curd is thoroughly digested. 



5. Do not mix 3 and 4 quite enough 

 but leave a little white undigested curd 

 on top. 



6. Put into tester and proceed with 

 rig. s. HOW the fat the remainder of the test according to 



column should be read. 



Exercise 1. 

 Data: 



Crefcto 



Application: 1. What will be the amount of butter-fat 

 in one year from a cow giving 5000 Ibs. of milk testing the 

 above percentage? 



