lO 
COLORADO EXPERIMENT STATION 
other fodders studied, one of which was studied as fully as the two 
already mentioned, namely corn fodder. This fodder is one easily di¬ 
gested in the sense in which we have indicated that the saltbush is 
difficulty digestible. By this I mean that comparatively small amounts 
of heat are used in the work of preparing this fodder for assimila¬ 
tion. In this case, we have a little less than nineteen and a half mil¬ 
lion units of energy appropriated and each sheep gained, the lot making 
an aggregate gain of three and a half pounds. This is the smallest 
amount of heat on \v’hich an actual gain was made. This shows the 
relative efficiency of the energy in the corn fodder, as compared with 
saltbush. This relative efficiency of the corn fodder would appear to 
be much greater if compared to that of sorghum in which form the 
animals appropriated twenty-five million units of energy and lost 8^ 
pounds. The fuel or energy values of the various extracts of sorghum 
were not determined but the coefficients of digestion, especially for the 
two large and important divisions represented by the muriatic acid ex¬ 
tract and the residue, cellulose, indicate a low digestibility of the carbo¬ 
hydrates. The proteids probably do not influence these results in any 
material way. The results obtained with sorghum, it having been fed 
alone, were surprisingly unfavorable. The large amount of heat used 
and the low coefficients of digestion found for the greater por¬ 
tion of the fodder indicates that it, like the saltbush, requires more 
work to bring it to an assimilable form than is an equivalent to the en- 
ergy yielded by the fodder. In the case of sorghum, the alcoholic 
extract is abundant and has a high coefficient of digestion, due, very 
probably, to the fact that it is rich in the two sugars, glucose and cane 
sugar. I did not determine the fuel values of this or any other of 
the extracts made of the sorghum. The fuel value of the fodder 
itself is almost exactly the same as that of the saltbush, which is low, 
thirty-eight hundred units of energy against forty-two hundred in the 
corn fodder, the actual difference being three hundred and fifty units 
for each gram of dry hay. 
§ 21. The three important portions of corn fodder are, the 
portion dissolved by eighty per cent, alcohol, the cellulose and the por¬ 
tion soluble in muriatic acid. These extracts, the alcohol and muriatic 
acid extracts, both have very high fuel values and are easily digestible. 
The residue or cellulose has a rather low fuel value but owing to its 
coefficient of digestion being high, it furnishes more energy than any 
other portion of the fodder, the alcoholic extract excepted. 
§ 22. The deportment of the proteids in this fodder is very 
different from those of alfalfa. The greater portion of them being 
found in the caustic soda extract in the latter case, while the greater 
portion is found in the alcohol extract of the corn fodder. The cel¬ 
lulose of the saltbush proved to be much less efficient in furnishing 
energy to the animal than that of alfalfa, but in comparing the efficiency 
of the cellulose of corn fodder and alfalfa we find that that of corn 
fodder is the more efficient. The animals did not eat the stalk with the 
pith cellulose if they could avoid it, so the cellulose in this case does not 
include much of the pith cellulose, though it does include some. 
