70 PROFITABLE DAIRYING 



3. Using the price per pound of butter fat just 

 obtained calculate the total returns from each herd in 

 the association. 



4. At the average cost of feed per cow given at the 

 bottom of the table what is the net profit made by each 

 herd? 



5. The average net profit per cow in each herd? 



6. Do you know the profit over cost of feed of your 

 own herd? 



7. By use of one of the methods described in the 

 last chapter determine this for the home herd. 



LABORATORY PROBLEMS 

 IX. To Test Samples of Milk Which Abe Pabtially Chubned 



It frequently happens that milk which has been put 

 in bottles and carried some distance becomes partially 

 churned. The difficulty in testing such samples arises 

 from the fact the milk cannot be accurately sampled. 

 The following method will give accurate results if 

 carefully performed. 



a. Take a small quantity of milk (200 to 300 c.c.) 

 and test to determine the true percentage of fat it 

 contains. 



b. Shake the remainder of the sample in a tightly 

 sealed bottle until butter granules appear on the sides 

 of the bottle. 



c. Add about 10 c.c. of ether to the sample to dis- 

 solve all the churned butter granules. If 10 c.c.'s are 

 not sufficient, add a few more. It is necessary to keep 

 an exact account of the amount used. 



d. When all the butter granules have been dis- 

 solved, sample as in the case of milk. Add only one 



