138 RESULTS OF EXPERIMENTS IN SWINE FEEDING 
estimate what the pigs will probably weigh at the end of the 
week, formulate a ration in accordance with this estimate, 
and gradually work them up to the quantity the standard calls 
for by the end of the week. Suppose we estimate that the 
pigs will gain 65 pounds during the week, making a total of 
850 pounds. Referring to our standard, we find that the daily 
water requirement per 100 pounds, live weight, has decreased. 
.38 of a pound by the end of the week, the digestible protein 
has increased .014 (say .015), of a pound, and the earbo- 
hydrate requirement has increased .02 of a pound. Hence, 
by the end of the week the pigs should be receiving daily, 11.7 
pounds of water, .615 of a pound of protein, and 2.22 pounds 
of carbohydrates per 100 pounds of their live weight. Mul- 
tiplying these amounts by 850 (estimated weight) and dividing 
by 100, we get the total daily requirement per 100 pounds, 
live weight, for the bunch of pigs at the end of the week— 
which amounts to 99.45 pounds of water, 5.2275 pounds of 
digestible protein, and also 18.87 pounds digestible carbohy- 
drates. 
We must now refer to table of digestible constituents, and 
add feeds in such proportions as to bring our ration into con- 
formity with the standard. Having arrived at our ration for 
the beginning of the week, and also estimated it for the close 
of the week, we can make each day’s feeding approach suffi- 
ciently close to the standard. At the close of the week the 
hogs are weighed, their gain estimated for the following week, 
the ration adjusted to the weight and age of the hogs, as it 
was done for the first week, and the operation repeated for 
each succeeding week. 
Features of the Standard—There are two things about 
the ‘standard which call for remark. In the first place, the 
writer’s experience is that the hog is a pretty good judge of the 
amount of water he requires, and the chances are that water 
