2 MODERN METHODS OF TESTING MILK 



The influence of breed. The following figures, 

 from the records of the N. Y. Agricultural Experi- 

 ment Station at Geneva, illustrate the influence of breed 

 upon the water content of milk : 



Per cent, of 

 NAME OF BREED water in milk 



Holsteiri Friesian 88.20 



American Holderness 87.35 



Ayrshire 87.25 



Short Horn 85.70 



Devon 85.50 



Guernsey 85.10 



Jersey 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: 



, Per cent, of 



MONTH OF LACTATION water in milk 



i 86.00 



2 86.50 



3 86.53 



4 86.36 



5 86.25 



6 86.00 



7 ' 05.82 



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 con- 

 tinuous decrease to the end of the lactation period. 



