THE DAIRY BREEDS OF CATTLE 267 
The Jerseys have been much used for grading on native 
cows to increase milk- and butter-production. Carefully 
selected bulls may be used for this purpose with very 
satisfactory results as the Jersey blood is very prepotent. 
301. Feeding and care. — Jerseys have a capacity for 
assimilating large quantities of food and may be forced 
to advantage when in full flow of milk, as all extra food, 
in such case, is converted into milk. When the milk-flow 
begins to slacken, the food should be reduced, especially 
the concentrates. The Jerseys are large eaters of rough- 
age and succulent feeds, as roots. 
On the Island the method of caring for the cows has 
been the same for nearly two hundred years. In the 
summer they are tethered in meadows and pastures, and 
in the winter are warmly housed at night. The same care 
should be taken in the management of Jerseys in this 
country. They should have plenty of pasture to run on 
in the summer, and they should not be confined in the 
winter in day-time except in very cold and inclement 
weather. They should be treated kindly, as they have 
ever been on the Island. Nervous cows should be excluded 
from the herd, as well as those giving small quantities of 
milk, and those not persistent in their milk. 
At one time the Jersey was supposed to be delicate, but 
the American breed of cows at this time seems to be con- 
stitutionally as strong as any other dairy breed, and not 
more subject to disease than other cattle, with possibly 
the exception of milk fever. But since the air treat- 
ment for this disease has been used, this heretofore dreaded 
affliction need no longer be considered a dangerous disease. 
302. Distribution. — The Jersey is very widely dis- 
tributed, due to its wide adaptation to conditions. As has 
been said, it is scattered through the United States and 
