8 



FIRST LESSONS IN DAIRYING 



mary glands is secretory. Milk as such does not 

 exist in the blood or elsewhere in the body. Dean 

 says the source of the different milk constituents 

 are probably somewhat as follows : 



"The water is derived from the food and drink of 



LARGE MILK VEIN, AND PROMINENT VEINS ON THE UDDER 



the cow by transudation from the blood, hence the 

 importance of clean food and pure water for the 

 cow. 



"The fat comes from the albuminous portions of 

 the food, and also, in all probability, to some extent 

 at least, from the carbohydrates and fat of the food. 



