THE PRODUCTION VALUES OF FEEDING STUFFS 671 



because they contain much crude fiber which causes much me- 

 chanical work but because the feeding stuff as a whole stimulates 

 the metabolism and causes a loss of energy which, though not 

 greater, or, it may be, even less, than in the case of concentrates, 

 is deducted from a much smaller amount of metabolizable energy 

 supplied by the less amount of substances digested. 



771. Relative values for concentrates. That the crude fiber 

 is far from being the only determining factor of the amount of 

 energy expended in consequence of feed consumption is clearly 

 shown by the majority of Kellner's experiments on concentrates 

 and roots. Although with the oil meals a close agreement of 

 the observed and computed results was obtained, in most in- 

 stances the observed net energy value fell considerably short of 

 that computed by the use of the factors of Table 205. The fol- 

 lowing table contains the results of the comparisons thus far 

 reported. 1 They show clearly that the digestible organic 

 matter has a very unequal value in different classes of feeding 

 stuffs, but a comparison with the percentages of crude or of 

 digestible nutrients also shows that the crude fiber fails in 

 these cases as a measure of the differences. 



TABLE 208. OBSERVED NET ENERGY VALUES FOR CATTLE AS PER CENT 

 OF COMPUTED 



Rye meal 93.5 per cent 



Bean meal 94.4 per cent 



Rye bran 79.0 per cent 



Wheat bran 77.3 per cent 



Dried brewers' grains 84.3 per cent 



Dried distillers' grains 88.2 per cent 



Rice meal 108.4 per cent 



Malt sprouts 85.8 per cent 



Potatoes 98.0 per cent 



Mangolds 86.9 per cent 



Fresh beet pulp 94.1 per cent 



Dried beet pulp 78.4 per cent 



In computing the net energy values of concentrates, there- 

 fore, Kellner made no correction for the crude fiber, but instead 

 corrected in each case the value computed from the digestible 

 nutrients by multiplying it by a percentage (Wertigkeit) taken 

 directly from the foregoing table when possible or estimated 



1 Ernahrung landw. Nutztiere, pp. 165-167. 



