42 STORRS AGRICULTURAL EXPERIMENT STATION. 
the first test, another twelve-days’ test was made of the same 
herd. A comparison was thus made of the yttiee of milk and 
butter-fat with the two different rations. i 
During the third winter (1894-95) four herds were visited, 
each herd being under observation for twelve days at two dif- 
ferent periods in the same manner as the three herds studied 
in 1893-94. 
The chief points upon which information was obtained were: 
Number of Animals tn 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 in 
milk at the time of the test. 
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. ‘This estimation was made in each case by the Station 
representative, and it is hoped that the errors of judgment may 
run more or less equally through all the herds examined. 
Number of months stnce 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, one course, 
more or less uncertainty in this regard. 
Weights of mtiltk-flow for the twelve days.—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 
test period as he had previously used. The quantity for each 
animal was weighed by the Station representative just before 
feeding. Any portions of the food left uneaten by the cows 
we ee 
