454 
Journal of Agricultural Research 
Vol. XI, No. io 
Table III.— Average digestibility of light and heavy rations 
Constituent. 
Light 
ration. 
Heavy 
ration. 
Dry matter.. 
Nitrogen. 
Carbon. 
Energy... : . 
Dry matter eaten per 1,000 pounds of live weight... 
. .pounds_ 
76. s 
75 - S 
76.1 
75-6 
8.62 
74*5 
70. 6 
74*3 
73*8 
16. 20 
Qualitatively the results correspond to those of other experiments 
both here and elsewhere (j, p. 6 i j-61S) 1 , but quantitatively the difference 
is less than has usually been observed, a fact for which no obvious 
reason appears. 
Effect of fattening. —Fattening appears to have had no distinct 
influence on the digestibility, the exceptions being the protein, non¬ 
protein, crude fiber, and ether extract in period 3. The average per¬ 
centages for the same ingredients as in Table III are shown in Table IV. 
Table IV. —Average digestibility before and after fattening 
Constituent. 
Before. 
After. 
Dry matter. 
Per cent . 
75*3 
73*3 
75 - 1 
74*5 
Per cent. 
7 S -8 
72. 8 
75-4 
74.8 
Nitmcren . 
Carbon . 
Rnertnr. 
URINARY EXCRETION 
The results upon the urine are recorded in Table 3 of the Appendix 
and are summarized in Table V. 
Table V.— Average daily excretion in urine 
Nitrogen. 
Carbon. 
Energy. 
Ratio of 
nitrogen to 
carbon. 
Energy 
per gram 
of nitrogen. 
Energy 
per gram 
of carbon. 
Gm. 
79*5 
139*4 
155-6 
107. O 
Gm. 
107.5 
191. 6 
218. 9 
136.1 
Calories. 
1,015.9 
1,712. 1 
2,045.8 
1, 3 l8 . 8 
35 
*:*• 37 
1:1.41 
1:1.27 
Calories. 
12. 78 
12. 28 
13 * !5 
12.32 
Calories. 
9 * 45 
8.94 
9-34 
9-65 
The percentages of the nitrogen, carbon, and energy of the feed which 
were excreted in the urine are shown in Table VI, from which it appears 
that the relative losses through this channel were less on the heavier 
1 Reference is made by number (italic) to “ Literature cited,” p. 464. 
