12 
COLORADO EXPERIMENT STATION 
§ 29. We find that the fuel value of the timothy hay is quite 
high, about forty-four hundred heat units for each gram of dry matter 
but the sheep can only utilize this energy to an extent of a little less 
than one-half, and as a result we find that timothy hay does not furnish 
enough energy to make a good fodder. The lot of sheep receiving 
the timothy appropriated nearly seventeen and a half million units of 
energy and showed a slight loss in flesh. 
§ 30. I have in this W'Ork refrained from analyzing the 
extracts further and have permitted some indefiniteness in the state¬ 
ment of the results, but I consider these points of no material import¬ 
ance to our present purpose. For instance, I have made no effort to de¬ 
termine whether the wood sugar, xylose, is made up wholly of this 
sugar, or is mixed with another closely related one. I have also 
considered it a matter of small importance in this study whether the 
reducing power found in the caustic soda extract is really due to wood- 
sugar or to one more nearly related to cane sugar. The fact has 
been established that in some hays, at least, the w-ood sugar is a mixture 
of two sugars and that the sugar present in the caustic soda solution 
probably does not belong to the group of wood sugars at all. These 
questions pertaining to the nearer chemical composition of the hays 
are interesting and important but for the purpose of this bulletin, I 
have deemed them omissible. The difference in the sugars from the 
alfalfa and other fodders has been mentioned, but this sugar, gal¬ 
actose, appears to be present in some of the other fodders, too, to a 
smaller extent. 
§ 31. We find the difference between these fodders so marked, 
especially, in regard to the readiness with which they appear to yield 
their energy to the animals and the w'ork wdiich is necessary to pre¬ 
pare the food constituents for assimilation, .that it does not appear 
strange that the fodders acually have very different feeding values. 
