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20 STORRS AGRICULTURAL EXPERIMENT STATION. 
The chief points upon which information was obtained were: 
Number of animals in the herd.—In considering the number 
of animals, only those which came into the test were included. 
Usually these were all of the cows on the farm which were 
giving a fair quantity of milk at the time of the test, except 
those which were nearly dry and a few which were “‘ off feed’’ 
for some reason. 
Breed, age, and approximate weight of each cow.—The breed 
and age were obtained as accurately as possible from the owner. 
Since it was not practicable to take to the farm scales large 
enough on which to weigh the cows, the weights were esti- 
mated. ‘his estimate was made in each case by the Station 
representative or the owner, and it is thought that the errors 
of judgment were not large. 
Number of months since last,calf.—In most cases the time at 
which the cow dropped her last calf was known. 
Number of months till due to calve.—There was, of course, 
more or less uncertainty in this regard. 
Weights of milk-flow for the full number of days of the test.— 
The milk of each cow at each milking was weighed as soon 
as milked, to the nearest tenth of a pound, by the Station 
representative. 
Percentages and amounts of butter-fat in the milk.—A sample 
of the milk of each cow, night and morning, was taken, and 
from the combined sample a determination of the quantity of 
butter-fat was made. ‘The Babcock method of fat determina- 
tion was employed. From the percentages of butter-fat in the 
milk, and the total weights of the milk, the daily yields of 
butter-fat were obtained. | 
Kinds and weights of foods used.—The feeder was requested 
to use the same kinds and amounts of feeding stuffs during the 
first test as he had previously been using. The quantity for — 
‘each animal was weighed by the Station representative just 
before feeding. Any portions of the food left uneaten by the 
cows were weighed, and due allowance was made for these 
uneaten residues in estimating the amounts daily eaten. Dur- 
ing the early part of the test, samples of each feeding stuff 
used were carefully taken and at once sent to the laboratory 
for analysis. From the results of the analyses and the weights 
fed, the total nutrients (protein, fat, nitrogen-free extract, and 
