148 



THE BABCOCK TEST 



produced an equal amount of milk during this period, cow No. 

 8 produced more than twice as much butter fat as cow No. 7. 

 Since fat is worth from 20 to 30 cents a pound, we see the 

 value of the Babcock test in enabling the farmer to weed out 

 the unproductive cows. 



The variations in the per cent, of fat in milk from the same 

 cow are also shown to be large. 



COMPOSITION OF MILK 



Forty-seven quarts of average cows' milk will weigh 100 

 pounds, of which 87 pounds is water, 3.8 pounds fat, 3.4 

 pounds casein and albumin, 5 pounds sugar, and .8 pounds 

 ash. 



^^ — 7 



} 





cc 

 17.t 



\ 



n 



/ 



v/ 



w 



Fig. 1. 



Fig. 2. 



U 

 Fig. 3. 



175" 



c.e. 



£8 



f-7 

 1-6 



£5 



1-4 

 1-3 



|-a 



Li 



Fig. 5. 



Fig. 4. 

 THE TESTING OUTFIT 



The smaller sizes of the Babcock testers are well adapted 

 for use on the farm. The test is simple and can be made by 

 any bright boy or girl after a reasonable amount of practice. 



