Digestive Coefficients of Poultry Feeds, etc. 
23 
TABLE i 
Summary Table Showing Ash Intake and Ash Outgo of Five Hens 
Days 
Total 
Amount 
Feed 
Total 
Amount 
Excrement* 
Percent 
Digested 
Total 
Amount 
Excess 
Ash 
Percent 
Digested 
Difference 
in 
Percent 
5th_ . - 
226 
85,9 
61,97 
4,35 
64.06 
2,09 
6th__ _ - 
230 
102,0 
55,23 
6,86 
58,31 
3,08 
7th_ _ 
248 
105,8 
56,34 
6,71 
59,28 
2,94 
8th_ -_ __ 
256 
99,5 
60,95 
6,07 
63,39 
2,44 
Total and averages 
060 
393,2 
58,62 
24,17 
61.26 
2.64** 
*In grains. 
**Final correction factor. 
From this table it is seen that the correction factor under the conditions under 
which these experiments were run is 2.64 percent. That is the average ash thrown 
off in the form of grit between the fourth and eigth days amounted to 2.64 percent. 
Graph 3 from hen 3 is given as it is an average result and will illustrate the curve of 
ash intake and outgo from the first day off of grit to the one hundredth day and then 
what happens when grit is then given and then to the 114th day. 
Hen No. 3 represented in the graph consumed 1.1 grams of ash in the feed the first 
day and gave off 2.2 grams of ash. The ash outgo increased until the fourth day, 
when it reached 3.5 gm. From the fourth to the twelfth day it consistently decreased 
until on the twelfth day the ash outgo was three-tenths of a gram less than the ash 
intake. From the twelfth to the one-hundred-second day the intake and outgo lines 
are constantly crossing and reciossing each other. On the one hundredth day a cup 
of grit was placed before the bird. There was an increase in ash outgo from the 
one hundred and first to the one hundred and third day, there was then a slight drop 
till the one hundred and sixth day and a continuous increase from the one hundred 
and sixth to the one hundred and fourteenth day when the experiment was discon¬ 
tinued. 
A summary study of all the tests show that the ash outgo for the first twelve days 
is always greater than the ash intake, thus indicating that the residual amount of ash 
is reached on or about the twelfth day. The graphs also show that as long as the bird 
is deprived of grit that the intake and outgo lines cont nuously cross each other, but 
upon giving the bird free access to grit on the second day there is a considerable 
increase in the ash outgo over that of the intake in the feed. 
This indicates that when the bird has free access to grit on range that she is contin¬ 
uously taking in new and fresh grit. 
Thus in Table I is given a final summary of the amount of feed con umed during 
each day of the normal four day digestion period, total amount of excrement voided 
and the percent of feed digested. The total amount of excess ash voided each day, 
the percent digested when the excess ash is taken into consideration and the difference 
is the correction factor. During the four day normal digestion period the five hens 
consumed 960 gins. feed. They gave off 393.2 gms. exc ement, showing 58.62 percent 
digested. They gave off 24.17 gms. more ash than they took in in the feed. When the 
excess ash was deducted from the excrement and the percent eed digested it shows 
that 61.26 percent is digested. A difference of 2.64 percent. This is the final correct ion 
factor to be applied to the digestive coefficient tables. 
