148 STORRS AGRICULTURAL EXPERIMENT STATION, 
DISCUSSION OF THE TESTS. 
flerd P. Tests Nos. 51 and 53.—Thirteen cows in this herd 
were included in this experiment, the same ones in both tests. 
Ten of the cows were Jerseys or grade Jerseys, and one was a 
grade Guernsey; these were estimated to weigh between 650 
and goo pounds each. ‘The two other cows were grade Dur- 
hams, weighing not far from 1100 pounds each. Most of the 
cows were giving a good flow of milk, none being due to calve 
in less than three months after the close of the second test. 
The herd was well stabled, and watered from a trough in a 
protected yard with a southerly exposure, in which the cows 
were allowed to exercise a short time each day during pleasant 
weather. The coarse fodders used consisted: of hay and corn 
silage. The hay was first quality early cut hay of mixed 
grasses, and was eaten without waste; the corn silage was 
made of corn harvested when the ears were beginning to glaze. 
The grain feeds used were wheat bran, wheat middlings and 
Chicago gluten meal. 
The first test with this herd began December 4, 1899, and 
continued twelve days. In this test the average daily ration 
for eacl cow consisted of between seven and eight pounds 
of hay, about thirty pounds of corn silage, and between eleven 
and twelve pounds of mixed grain feeds. The average amount 
of digestible protein in the ration was 2.7 pounds daily. The 
ration was a narrow one, having a nutritive ratio of 1:5.3. 
There was an interval of seventeen days between the two 
tests. The second test began January 2, 1900, and continued 
eleven days. In the ration proposed for this test, oat and pea 
hay was substituted for the hay of mixed grasses used in the 
first test, the proportion of wheat bran used was considerably 
increased, and cotton seed meal was added to the ration. ‘The 
average basal ration for each cow in the herd consisted of 
about eight pounds of oat and pea hay, thirty pounds of corn 
silage and between eight and nine pounds of mixed grain feeds. 
This ration was planned to furnish two pounds of digestible 
protein per day, but according to the analyses there was really 
2.3 pounds. 
There were three groups of cows that received the mixed 
grain feeds called protein mixture in addition to the basal 
ration. In the first group there was one cow, which had one. 
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