70 REPORT OF DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
Special analyses were made of all the foods. The coefficients 
of digestibility used in the calculations were the averages from 
American determinations when several were to be found, but 
many of them were from European data. These calculations 
were made several years ago when factors from recent investiga- 
tions were not available. The coefficients used differ somewhat 
from the latest averages but not enough to have a recalculation 
affect the general results. In Table A are given those used for 
the several foods. 
Selecting records from a system of feeding conforming to other 
purposes did not permit an absolute uniformity in all relations 
essential to a direct and unqualified comparison of the different 
rations. The averaged groupings are therefore not by any means 
satisfactorily complete and full,although the volume of testimony 
in a degree compensates for some of the lack of uniformity. 
While a large number of records may cover one change in a 
ration, there may be comparatively few that afford data con- 
cerning some corresponding change, desired for comparison, so 
that in this respect also undesirable irregularity exists. Evi- 
dence only of the immediate, or perhaps stimulating, effect of 
the modified rations is offered. There is taken into consider- 
ation no intermediate period to permit full adjustment to the 
changed food, and the efficiency of the different rations for sus- 
tained milk production over longer periods is not shown. The 
record is taken for from two to four weeks before a change in a 
ration and for about the same time immediately following. 
TABLE A.—AVERAGE COEFFICIENTS OF DIGESTIBILITY. 
N.free Fats (ether 
Protein. Fiber. extract. extract). 
W heat bran }.@s awn once + apis ata 78. 33. 6B 76. 
(JOTTIITOAL 35 ssn hee ett Boee ae kes , (6. 58. 87. 92. 
CTTOUNUSURIUS a ep ss bo Cota mate ee eee 78. a4 0 (Wes 84. 
Wheatmiddlines: oft tee 82. 33: 88. 85. 
Oo Pein seen Smeal. 2. ee eee 86. 50. 80. 90. 
UOthoOn seed Sinoal 2. ics = Saeee eae 89. Bos 68. 95. 
Glutén Panels ee5F02 SAY Se Ee oi Tes 33. OI. 88. 
luten "LECUr las pets A ith cok zs 86. 34. 92. 82. 
NP, SUCRE ARG Ana aca es cee hee S7. G1. 86. 91. 
Brewers’ grains.. ee erevervee eeeeeeeoee 1 (i bs 46. 5d. 86. 
