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 III milk 



Holstein Friesian 88.20. 



American Holderness 87.35 



Ayrshire 87.25 



Short Horn 85.70 



Devon 85.50 



Guernse\^ 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: 



MONTH OF 



I 



2 



3 

 4 



5 

 6 



7 

 8 



9 

 10 



ACTATION 



Per cent, of 



zvater in milk 



86.00 



86.50 



86.53 

 86.36 

 86.25 

 86.00 

 85.82 

 85.67 

 85.54 

 85.17 



There is noticeable a general tendency for the 

 amount of water in milk to increase after the first 

 three months of lactation, after which there is a con- 

 tinuous decrease to the end of tlie lactation period. 



