TESTING THE FARM HERD 57 



nually. The test is 4.2 per cent. Then 5,000 X 4.2 

 per cent = 210 pounds butter fat; 1/6 of 210 is 

 35 ; then 210 + 35 = 245, or this cow produces 

 approximately 245 pounds of butter annually. 



How to apply the results of the test. Every 

 good dairyman should know about what each 

 cow in his herd is producing and send to the 

 slaughter house all cows that are not yielding 

 him a profit. The only way for him to learn 

 this is by weighing and testing the milk from 

 each cow in some such manner as has been out- 

 lined herein, preferably for every day of the 

 time that the cow is in milk during the year. 

 It should also be added that he should take into 

 account the amount of feed consumed by each 

 cow. It is not always the largest fat producers 

 that are the most profitable cows, but the ones 

 that produce the largest amount of fat at the 

 least cost. 



A single cow's record. In order to stimulate 

 an interest in the production end of dairying, it 

 is usually an easy matter for a high-school 

 teacher to make arrangements with some party 

 owning a cow whereby students are allowed to 

 keep records of the production of some particular 

 cow or cows. On the next page is given the 

 record of a single cow in a herd belonging to a 

 cow-testing association organized and conducted 

 by schoolboys: 



