986 
Journal of Agricultural Research 
Vol. XXX, No. 10 
gravity 1.84 and under gentle heat. 
The original moist composites were 
used to obviate loss of nitrogen on 
drying and for comparison of the data 
with those on the urine composites. 
This preliminary solution was made up 
to volume with distilled water, and 
aliquots of the diluted solution were 
used for analysis. Potassium oxide 
was determined by the perchlorate 
method, phosphorus pentoxide by the 
volumetric molybdate method, and 
nitrogen by the Ivjeldahl process. 
All results so obtained are reported 
in the following tables: 
Table I. — Analysis of feeds, original 
moist basis 
, K 2 0 
P2O5 
N 
! 
\Per cent 
Per cent 
Per cent 
Soybean hay___ 
_! 2. 290 
0. 490 
1.344 
Alfalfa hay_... 
_ ! 2. 260 
.960 
2. 660 
Corn silage_ 
_ .300 
. 146 
.388 
Oats_ 
_! .540 
1. 140 
2.016 
Corn_ . 
_l .407 
.850 
1.596 
Oil meal.. ... . .. 
_ 1.270 
1.860 
5. 656 
At the close of the first 5-day diges¬ 
tion trial, the refuse was carefully col¬ 
lected and weighed and a composite 
sample analyzed. This refuse was found 
to be almost wholly the stems of soy¬ 
bean hay. At the close of the second 
trial period there was practically no ref¬ 
use obtainable from the stalls, so only 
one analysis is reported. Results are 
given in terms of average pounds per 
day. 
Table II.— Analysis of refuse feed, first 
digestion trial 
Cow 
No. 
Ref¬ 
use 
feed 
K 2 0 
P 2 O 5 IS 
1 
Lbs. 
Lb. 
P.ct. 
Lb. 
P. ct. Lb. 
P. ct. 
1 
0. 345 
0. 0030 
0. 90 
0. 0004 
0. 12 0. 0022 
0. 64 
2 
.528 
.0048 
.90 
.0006 
. 12 . 0030 
.58 
3 
.806 
.0072 
.90 
.0010 
.12 . 0088 
1. 10 
4 
1 
1.600 
.0144 
J 
.90 
.0018 
. 12 .0018 
. 12 
Using the data in Tables I and II, the 
quantities of the several materials fed 
per day being known by reference to the 
feeding tables for the two trials, the 
data given in Tables III and IV are 
easily computed. These tables present 
the actual amounts of each of the three 
constants fed, wasted, and consumed 
during the two trials. 
Table III. — Computation of oxides of potassium, phosphorus and nitrogen in feed 
FIRST DIGESTION TRIAL 
Feed 
Cow No. 1, Jersey 
' 
Cow No. 2, Ayrshire 
Cow No. 3, Guernsey 
Cow No. 4, Holstein 
Feed per day 
^ ! 
S-i 
0 
a 
O 
W 
>2 
CC 
TT 
*- 
c, 
a 
c 
a 
N per day 
Feed per day 
>> 
S3 
<D 
a 
O 
W 
>> 
CS 
T3 
s-i 
ffl 
a 
O 
a 
N per day 
Feed per day 
K 2 O per day 
P 2 O 5 per day 
N per day 
Feed per day 
K 2 O per day 
>1 
0 
■0 
C 
f-H 
N per day 
Lbs. 
Lb. ; 
Lb. 
Lb. 
Lbs. 
i Lb. 
Lb. 
Lb. 
Lbs. 
Lb. 
Lb. 
Lb. 
Lbs. 
Lb. i 
Lb. 
Lb. 
S. B. hay. 
14 
0. 3206 0. 0686 
0. 1882 
10 
0. 2290 
0. 0490 
0. 1344 
10 
0. 2290 
0. 0490 
0. 1344 
12. 8 0. 2930 0. 0628 
0. 1720 
Silage_ 
30 
.0900 
. 0438! 
. 1164 
25 
. 0750 
.0364 
.0970 
25 
. 0750 
.0364 
.0970 
30 
. 0900 
.0438 
. 1164 
Oats_ 
4 
.0218 
. 0456j 
. 0806 
4 
.0218 
.0456 
.0806 
4 
.0218 
. 0456 
.0806 
4 
. 02181 
. 0456 
. 0806 
Corn 
5! 
.0204 
. 0424 
.0798 
5 
.0204 
.0424 
.0798 
4 
.0162 
.0340 
.0638 
5 
. 0204 
.0424 
.0798 
Oil meal. 
1 
.0126 
. 0186 
. 0566 
1! 
.0126 
.0186 
.0566 
1 
. 0126 
.0186 
.0566 
1 
.0126 
. 0186 
. 0566 
Total. 
. 4654 
. 2190 
. 5216 
. 3588 
. 1920 
.4484 
.3546 
. 1836 
.4324 
.4378 
.2132 
. 5054 
Less ref¬ 
use_1 
.0030 
.0004 : 
.0022 
.0048 
. 0006 
.0030 
.... 
.0072 
.0010 
. 0088 
.0144 
.0018 
.0018 
Tot a 1 
! 
j 
e 0 n - 
sumed. 
. 4624 
.2186! 
. 5194 
.3540 
. 1914 
.4454 
---- 
.3474 
. 1826 
. 4236 
. 4234 
. 2114 
. 5036 
_' 
1 
1 
1 
i 
SECOND DIGESTION TRIAL 
Alfalfa_ 14 
0.3164 
0.1344 
0. 3724 
10 0. 2260 0. 0960 0. 2660 
10 
0. 2260 
0. 0960 0. 2660 
12 0. 2712 0.1152 0.3192 
Silage_' 30 
.0900 
.0438 
. 1164 
25! 
. 0750 
.0364 .0970 
25 
.0750 
. 0364 
.0970 
30 
. 0900 
.0438 .1164 
Oats_ 1 4 
.0218 
. 0456 
. 0806 
4i 
. 0218 
.0456; . 0806 
4 
.0218 
. 0456 
.0806 
4 
.0218 
.0456 .0806 
Corn_ 5 
.0204 
.0424 
. 0798 
5: 
.0204 
. 0424 .0798 
4 
. 0162 
. 0340 
. 0638 
5 
.0204 
.0424 .0798 
Oil meal.j 1 
.0126 
■. 0186 
.0566 
1! 
.0126 
.0186 .0566 
1 
. 0126 
.0186 
. 0566 
1 
.0126 
.0186 .0566 
Total.!_ 
.4612 
.2848 
. 7058 
I 
1 
. 3558 
.2390, .5800 . 
---- 
.3516 
. 2306 
. 5640 
.... 
. 4160 
. 2656 . 6526 
