CAROTIN, THE PRINCIPAL YELLOW PIGMENT OF MILK FAT 



427 



albumin content of the milk. The result points to the probabilit) 

 of a relation between the higher color and the increase in albumin. 

 Additional evidence pointing to the same relation is the presence of 

 extremely high color along with a very abnormal amount of albumin 

 in colostrum milk, as pointed out later in this paper. 



An attempt was made to determine if any definite relation 

 exists between the albumin and color as found in the milk of 

 various individuals. The milk of 12 cows representing the Jersey, 

 Holstein and Ayrshire breeds was used. The feed received was 

 pasture grass and some grain. The color of the milk fat and the 

 percentage of albumin were determined for each animal. The results 

 of the study are given in Table No. 6. 



TABLE No. 6. RELATION BETWEEN THE AI/BUMIN CONTENT OF MILK AND THE 

 COLOR OF MILK FAT, UNDER NORMAL CONDITIONS. 



"J." stands for Jersey, "H." for Holstein, "A." for Ayrshire. 



There appears to have been no relation between the albumin of 

 the milk and the color of the milk fat of these animals. It is not 

 considered however, that these results are conclusive either as prov- 

 ing or disproving the supposition that such a relation exists. Our 

 knowledge of the subject is too limited at present to enable us to 

 control all the factors that enter into the question. 



THE TRANSPORTATION OF CAROTIN AND XANTHOPHYLLS BY THE 



BLOOD SERUM. 



When it had been shown conclusively that the lutein of the 

 blood serum of the cow is composed of the carotin and xanthophyll 

 pigments of the food, taken up along the digestive tract and transmitted 

 by means of the blood to the fat synthesizing cells of the milk glands 



