PHYSICAL PROPERTIES OF MILK 



87 



lactation, age of the animal, and volume of milk production, the 

 results being given in tables. 



Influence of breed on the color of milk whey (Palmer and Eckles) . 

 The results according to breed are given in the table below. 

 The average tintometer reading for the Ayrshires was found 

 to be 4.75 units of yellow ; for the Jerseys, 3.59 units of yellow ; 

 for the Holsteins, 2.41 units of yellow ; and for the Shorthorns, 

 2.15 units of yellow. 



INFLUENCE OF BREED ON COLOR OF MILK WHEY 



These colorimetric averages emphasize what was found by 

 mere observation of even the cloudy yellow whey after removal 

 of the casein, namely, that the Ayrshire and Jersey milk is char- 

 acterized by yielding much higher-colored whey than Holstein 

 and Shorthorn milk. In some cases it was possible to select 

 the samples of Ayrshire milk from a mixed lot of Ayrshire, Jersey, 

 and Holstein milk, on account of its relatively higher-colored 

 whey. Only in a few cases was the Jersey whey as high colored 

 as the Ayrshire whey. 



These figures, showing such a marked difference between the 

 average color of the whey of the milk from the four different 

 breeds, when taken into consideration with the fact that each 

 breed represents widely different conditions of milk production, 

 stage of lactation, etc., would indicate that the color of the milk 

 whey is primarily a breed characteristic. Within narrower 

 limits it also appears to be an individual characteristic. 



