THE DAIRY BREEDS OF CATTLE 265 
nearly six months. The Jerseys not only gave over forty 
pounds of milk per day, but the milk was the richest of 
any in butter-fat, averaging 4.7 per cent, or an average 
of more than two pounds of butter per day for each cow, 
making a total of 274 pounds in 120 days. In the two 
months in which they were milked prior to the beginning 
of the test, they should have produced about the same 
amount of butter in proportion to the time as they had 
during the test, which would give an average for each cow 
for six months of 4103 pounds of butter. When it is 
remembered that the average dairy cow gives less than 
250 pounds of butter per year, these accomplishments seem 
all the more remarkable. These results were obtained 
without withdrawing a single cow because of sickness. 
They were fed on a profitable basis, each cow earning 
over cost of feed nearly $40, or a daily profit of 43 cents. 
It is interesting to compare results during the first and 
last part of the test for the purpose of showing the per- 
sistency of production and endurance. During the first 
ten days of the test, the Jerseys gave 10,942 pounds of 
milk, or an average to a cow a day of 43.8 pounds; aver- 
age per cent of fat in the milk, 4.25; total pounds of fat, 
466, or an average to a cow a day of 1.86 pounds. During 
the last ten days they gave 9382 pounds of milk, an aver- 
age of 37.5 pounds to a cow; average per cent of fat in 
the milk, 5.13; total amount of fat, 481.1 pounds, or an 
average to a cow each day of 1.92 pounds. While the cows 
decreased in flow of milk, they increased both in percent- 
age and amount of fat, and a general improvement in the 
productive capacity of the Jerseys is indicated by a com- 
parison of the two tests. 
Subsequent records show that the milking capacity of 
the Jersey is being developed, without detriment to the 
