THE DAIRY HERD. 17 



is necessary to do efficient work both in the 

 creaming and churning. 



The average work done by the gravity system 

 of cream raising would not warrant us in 

 adding one-eighth to the fat found by the test 

 to secure the probable butter, but with the 

 separator this increase of butter over fat should 

 be obtained, and if it is not the cause should 

 be looked for and removed. By adding one- 

 eighth to the 2.66 Ibs. of butter-fat we get 2.99 

 Ibs. of butter in the three days, or practically 

 one pound per day. 



Simplest way to test. A simpler form may 

 be used. It will not give as accurate results as 

 the three tests, but is very much better than 

 no test. 



I have learned by following my individual 

 cow tests that my cows averaged for 8.4 months 

 the same as the average of the first six months. 

 In other words, if a cow averaged 30 Ibs. per 

 month for the first six months she would make 

 8.4 times that for the year's work and drop her 

 calf at the same time as the previous year. 

 She should give enough milk after the 8.4 

 months to make the 2.4 months average with 

 the first six months. I have proved this work 

 in my dairy. This does not prove that it would 

 be a reliable rule in all cases. 



When a cow is judged on a single test it 

 should cover one week, the milk being weighed 



