TESTING FOR P.UTTP:R FAT. 



33 



T" test milk for butter fat you must hnve a r>abcO':k Tester and bottle. 

 Measure the milk with a pipette. Measure 17.6 c. c. (cubic centimeters) of milk 

 with the pipette and put in the test bottle. To this add 17.5 c. c. of sulphuric acid 

 and mix by shaking. 



Then put in the tester and run the tester for live minutes, then add enough 

 warm water to bring the butter fat up into the graduated neck of the bottle where 

 It can be read. Run the tester one minute more and your test is ready to read. 



You know how many pounds of milk your cow gives and how much it tests. 

 Now, to find how much butter she is producing : Multiply the pounds of milk by 

 the per cent of butter fat, then multiply by one and one-sixth and this will give 

 you the amount. For example, your cow gives in one day 38 pounds of milk 

 testing 4.2 per cent. Vou multiply 38 pounds of milk by 

 .042 butter fat. 



76 

 152 



1.596 pounds butter fat. 



One pound of butter fat will make 1 1/6 pounds of butter; so you multiply 

 1.596X1 1/6=1.862 pounds butter. 



This shows just how much liutter your cow is producing a day. 

 If you sell your butter at 2Sc per pound your cow is earning for you 46'.i cents 

 a day. 



1.862 pounds butter. 

 $ .25 



9310 

 3724 



$.46550 

 From this subtract the cost of feed and you will have the net earnings of your 



READ WHAT 

 THE OWNER 



SAYS 



Waterloo, Iowa, 12-12-TO 

 Dr. David Roberts, 



Waukesha, Wis. 

 Dear Doctor : 



I am sending you a photo- 

 graph of the Grand Champion 

 Guernsey cow. Bo-Peep, which I 

 I called you to Chicago to treat. 



She arrived home from the Na- 

 tional Dairy Show in e.xcellent con- 

 dition and I very much appreciate 

 the professional attention that you gave her while there. 



Yours very truly, 



W. W. Mabsh. 



