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I50 STORRS AGRICULTURAL EXPERIMENT STATION. 
the relative economy of feeding according to the yields of but- 
ter fat. In every case the cost of producing roo pounds of 
milk, or one pound of butter, was less with the groups in the 
second test than with the corresponding cows in the first test. 
Hlerd QO. Tests Nos. 52 and 54.—This was a small, well 
managed herd. Hight cows were used in the tests, the same 
cows in both tests. They were all grade Jerseys, estimated to 
range in weight from 625 to 850 pounds and to average about 
750 pounds. Most of the cows had calved within six months 
of the beginning of the first test, and none were due to calve 
until more than four months after the close of the second test. 
The cows were fed a large variety of feeds. "The coarse fod- 
ders used were home grown, of good quality, consisting of 
early cut hay, rowen hay, Hungarian hay, corn stover and oat 
straw, the latter being fed only in small quantities. The grain 
feeds included H. O. dairy feed, provender (ear-corn and oats 
ground together), spring wheat bran, cotton seed meal and 
Buffalo gluten feed. 
The first test began December 18, 1900, and continued twelve 
days. In this test all the cows in the herd were fed the same 
ration. Hach cow received a rather heavy feeding of coarse 
fodders, about twenty-five pounds per day, and a rather light 
feeding of grain feeds, about four pounds per day. ‘The differ- 
ent varieties of both coarse and concentrated fodders mentioned 
above were used in about the same proportions each day. With 
this ration each cow was receiving about 2.2 pounds of digesti- 
ble protein daily. 
After an interval of sixteen days the second test was begun 
on January 15, 1901, and continued twelve days. In the basal 
ration for this test the amount of coarse fodder was reduced to 
about 20 pounds per day for each cow, by omitting the Hunga- 
rian hay, the supply of which was exhausted, and feeding the 
other fodders in about the same quantities as in the first test. At 
the same time the amount of grain feed was increased to about 5 
pounds per day for each cow. With this basal ration each cow 
received about 2.0 pounds of digestible protein per day. 
There were two groups of cows in this test. The three cows 
in the first group received the basal ration alone, but the cows 
in the second group received in addition 2 pounds of the protein 
mixture, which increased the digestible protein in their ration 
to 2.6 pounds per day. 
