BREED VARIATIONS IN MILK. 



383 



although there were more present than in the correspoudiug 

 Jersey milk. See Fig. III. 



Fig. ni.— Globules magnified 813 times. 



The properties of the globule also show some breed varia- 

 tions. The envelope to the Jersey globule seems weaker 

 than the corresponding envelope in the other breeds, and 

 more readily broken. This cohering in the Jersey milk- 

 globule is also more readily acted upon by the chemical 

 changes induced in the milk by time. When the old cream 

 of these breeds is examined microscopically, it is 'ound that 

 the Jersey globule is more readily broken or distorted by 

 pressure, than the others. Practically, therefore, this milk 

 should be skimmed at an earlier period of the souring change, 

 than should the other milks. I am certain, from impressions 

 gained from my own experiments, that the Jersey milk should 

 be skimmed certainly not later than when the milk commences 

 to thicken or " lobber " at the bottom of the pan, while the 

 Ayrshire milk should pass considerably beyond this point, 

 and develop somewhat more acidity before the cream is 

 removed. 



Experiment VIII. 



Average size of 

 Globule. 



Churning, 



Ayrshire, 

 Jersey, 



Ayershire, 

 Jersey, 



4666" 

 5680" 



6000" 

 5940" 



3^ days old. 

 old. 



new milk, 

 new milk. 



20 minutes. 



8 "t 



* Butter came in 15 minutes. 



t Butter came in 5 minutes. 



