CONTENTS ix 



CHAPTER IV 



PAGES 



PHYSICAL PROPERTIES OF MILK 69-101 



Form of fat globules 69 



Size and number of fat globules 70 



Influence of breed 70 



Influence of age of cows on number and size of fat 



globules 72 



Influence of period of lactation on size of fat globules 73 



Specific gravity of milk 73 



Odor of milk 74 



The yellow color of milk and milk-fat .... 75 



Source of the yellow color of milk-fat ... 77 



Relation between color of milk-fat and breed of cow 78 



The pigments of the fat from colostrum milk . . 82 



The yellow pigment of milk whey .... 85 



Factors influencing the color of milk whey . . 85 



Influence of breed on the color of milk whey . 87 

 Influence of the stage of lactation on the color of the 



whey 88 



Influence of the age of the animal on the color of 



the milk whey 88 



Influence of the volume of milk production on the 



color of the milk whey .... 88 



Influence of feed on the color of the milk whey . 89 



Viscosity or consistency of milk 91 



Effect of physical agents 92 



Heat 92 



Centrifugal force 94 



Effect of chemical agents 95 



Acids 95 



Alkalies 95 



Conclusions ........* 96 



The specific heat of milk and milk derivatives . . 96 



Specific heat of whole milk 98 



Specific heat of whey .... 99 



Specific heat of skim-milk ....*. 99 



Specific heat of cream .... 99 



Specific heat of butter 100 



Specific heat of butter-fat 100 



