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DAIRY LABORATORY GUIDE 



EXERCISE 5 



TESTING SKIMMILK, BUTTERMILK, AND WHEY 



Object: To determine the percentage of butter-fat in 

 skimmilk, buttermilk, and whey by the Babcock method. 



Apparatus : Samples of each kind of product, two skim- 

 milk test bottles, and testing outfit. 



Steps : Number the test bottles 1 and 2 and then measure 

 17.5 c. c. of the sample to be tested into each and proceed with 

 the test as usual. The only difference in making a test of 

 these products and that of the whole milk is in using a double- 

 neck bottle. 



2. Use a little more than 17.5 c. c. of acid in testing prod- 

 ucts low in butter-fat. 



3. In case air bubbles collect in the neck of the bottle 

 when adding the water, tap the bottle gently on the table. 



4. Learn to read accurately, as the graduations on the 

 bottles may differ. 



Data: 



Application: 1. How much butter-fat will be lost in 

 4500 Ibs. of skimmilk according to above tests? 



2. What will be the cash value of the butter-fat at cur- 

 rent prices per lb.? 



