CHAPTER XXII. 



Engorgement and Artery Relaxation in Practk'e. 

 Reasons of Abortment at Various Stages of Pregnancy. 



The fact is well known that a very large majority of 

 milk cows are fed too sparingly rather than too much ; but 

 are not over-fed ; nor do they have their feed rapidly in- 

 creased at any time. Accordingly a very large majority 

 of dairy cows are exempt from the abortion trouble. The 

 dairy cows of Ohio are not many of them over-fed, as 

 their excess of yield over that of the ordinary cows of the 

 State is only 35 per cent, or only half as great as the ex- 

 cess of yield by dairy cows in the New York dairy dis- 

 tricts. So, from their comparatively small excess of yield, 

 the dairy cows of Ohio are almost entirely exempt from 

 udder-supply artery engorgement in any relaxing degrees. 

 Consequently, abortion is rarely known or heard of in 

 Ohio. 



In the coast-country cows of Holland, Holstein, and 

 other parts of Western Europe, abortions are very rare.* 

 Yet the very large yield of many of these coast-country 

 cows is a constant source of admiration to American dairy- 

 men. 



Why are the udder-supply arteries of Dutch and Hol- 

 stein cows exempt from engorgement, and the cows from 

 abortion, when their 3'ield, ami particularly the quantity 

 of blood, and the size of their udder-supply arteries is so 

 much larger than in the moderate-yielding cows of the 



* So Pnif. Gi-n. I[. Cook, of \\\v New Juryey Agriciiltiirftl C'ollcj^i', infornietl 

 MS afU'i' ilia ti'ip to thai country to ptirclmse cows ^^ol^c ycnr^ ii^^o. 



