The Milk Glands and their Functions. 



81 



bone, to be eventually united to the internal thoracic 

 vein (the mammary vein of the human). 



The mammary vein then will be accepted as affording 

 some indication 

 at least of the 

 milking capabili- 

 ties of a cow. 

 Some breeders' 

 associations call 

 for certain ar- 

 rangements of 

 those veins, as 

 follows: Single 

 and double ex- 

 tension, single 

 and double "'"--.. ... ... - "*"" 



bran ches, s i n g 1 e A Funnei-shapea udder. 



and double chest extension, or umbilical (navel) veins. 

 The wells vary in number from one to three on each side 

 of the animal ; they should be of good size. 



The greater the capacity of the arteries and veins con- 

 nected with the udder, the larger the milk secretion will 

 usually be. Theory and practice then seem to unite 

 and back up the ideals of the dairyman, one of which is 

 a great development of the mammary veins. The arte- 

 rial supply cannot be seen, and only parts of the venous 

 system of the udder are visible, viz. , the abdominal veins 

 and those underlying the skin of the udder, yet reason- 

 able conclusions can be drawn from the development of 

 the milk veins. 

 6 



