Selection of Cows. 61 



I have in my own dairy a liigh grade Jersey heifer that 

 exliibits as good percentage of cream in one hour, when the 

 milk is set in test tubes, as at any time after. The sixth of 

 October last, I filled a six inch test tube with her milk, 

 and it was carried at once in a person's hands, riding in a 

 buggy, nearly four miles to a fair ; it then showed nearly 

 twenty -five per cent of cream, and did not show better 

 afterwards. 



Scientific men would say, the butter globules in her milk 

 are large and uniform in size. 



I have also a fine grade Ayi-shire cow, eight years old : 

 her milk shows the best percentage of cream in about twen- 

 ty-four hours. The butter globules in her milk, or at least 

 a portion of them, are small. Large globules rise quickly, 

 small ones slowly. 



You will readily see that if all our cows were like the 

 Jersey heifer, it would greatly simplify the cream rising 

 process. I believe we may have them by careful breeding. 



Experiments prove that large globules rupture more 

 easily in churning than small ones, and from this fact, it has 

 been thought — and perhaps some experiments seem to prove 

 — that there would be loss in churnino- cream containino^ 

 large globules with cream containing small globules. 



I chose the cream from these two cows with which to make 

 an experiment to satisfy' myself upon this point, remembering 

 that one experiment does not always prove a thing, but 

 helps to prove it. 



I weighed carefully the milk, cream, butter and butter- 

 milk of each cow separately, and noted the time required 



