42 



MANUAL OF MILK PRODUCTS 



Influence of Breed upon Water-content of Milk 



Name of Breed 



Holstein-Friesian . . 

 American Holderness 



Ayrshire 



Shorthorn . . . 



Devon 



Guernsey . . . . 

 Jersey 



Percentage of 

 Water in Milk 



88.20 

 87.35 

 87.25 

 85.70 

 85.50 

 85.10 

 84.60 



The influence of lactation. 



The variation of water in milk, as affected by advance of the 

 lactation period, is illustrated by the following figures, which 

 cover a period of ten months from the time of calving : 



Month of Lactation 



Percentage of 

 Water in Milk 



1 



86.00 



2 . . 



86.50 



3 



86.53 



4 



86.36 



5 



86.25 



6 



86.00 



7 



85.82 



8 



85.67 



9 



85.54 



10 



85.17 







There is noticeable a general tendency for the amount of 

 water in milk to increase for the first three months of lactation, 

 after which there is a continuous decrease to the end of the 

 lactation period. 



