206 



Cattle Prohlems. 



with a source of reference, showing certain and large per- 

 centages of increase in blood, artery size, etc., that take 

 place at the same time, with excessively rapid increase 

 in milk-yield. It will be understood that these estimates 

 are only approximate calculations. But they are believed 

 to be under rather than over the extent of expansion in 

 the udder-supply arteries by increase of blood. 



Tables of figures are dry reading, but the subject is so 

 important, that it seems necessary to elucidate certain de- 

 grees and rates of increase in blood, and in artery size in 

 this manner. 



TABLE. 



The process of artery relaxation is explained early in 

 this chapter. We now desire to show certain extreme 

 rates and degrees of the udder-supply artery engorgement, 

 which leads to abortion in many instances. 



The expansion of milk-glands and udders of cows by and 

 according to every increase in yield, is apparent to any 

 observer. And wlien the 3'ield of cows is increased by 



