6yo 



NUTRITION OF FARM ANIMALS 



TABLE 207. NET ENERGY VALUES or ROUGHAGES FOR CATTLE 

 Per 100 Pounds Dry Matter 



For finer materials like chaff, presumably requiring a less 

 expenditure for mastication, 3 1.8 Therms per 100 pounds of total 

 crude fiber was deducted. For green forage containing 16 per 

 cent or more of crude fiber the same deduction was made as for 

 dry forage and for that containing 4 per cent or less of crude 

 fiber, the same as for chaff, while between these limits a sliding 

 scale was used. This correction for crude fiber was applied 

 only to roughage. 



Kellner ascribed this apparent effect of crude fiber largely 

 to the mechanical work required for its mastication and trans- 

 portation through the alimentary canal, but in part also to the 

 fermentations to which it is subject ; in other words, he ascribed 

 it to the so-called " work of digestion." In reality, however, 

 the crude fiber can be regarded only as a convenient empirical 

 measure of the differences between concentrates such as the 

 oil meals and roughage. It has already been shown from Kell- 

 ner's own experiments and from others (762) that the loss of 

 energy in this way, far from being greater, is on the whole rather 

 less with roughages than with concentrates and that the me- 

 chanical work of the digestive organs is probably a rather small 

 factor in it. Roughages have relatively less net energy value, not 



