Holstein-Friesians 145 



Advanced Registry. Admission to the Ad- 

 vanced Registry is by official tests for the 

 quantity of butter fat produced in seven days. 



The amount of butter fat produced by a 

 cow depends upon two factors, one of which 

 is the quantity of milk produced, and the 

 other of which is the percentage of fat in the 

 milk. Of these, the percentage of fat is more 

 highly variable than the quantity of milk and 

 is the more important factor in determining 

 a cow's admission to the Advanced Registry. 

 Fat is only one of the several solids in milk, 

 and the percentage of fat in the milk of a cow 

 is not affected in any way by the amount of 

 energy she has expended in producing milk. 

 As a consequence, the age of the cow, or 

 the age of her dam, has nothing to do with 

 the amount of fat she produces, except as the 

 amount of fat is influenced by the amount of 

 milk. 



It may appear that if the amount of fat is 

 influenced by the amount of milk, and the 

 amount of milk is influenced by the ages of 

 the cow's dam and earlier female progenitors, 



