THE PRODUCTION VALUES OF FEEDING STUFFS 669 



Obviously the percentages in the last column are analogous 

 to those obtained by Rubner and by Lusk (759) in experi- 

 ments on dogs, and the differences between the two sets em- 

 phasize the differences in the nutritive processes of the two 

 species. 



770. Correction for crude fiber. Kellner then proceeded to 

 test the applicability of these factors to the ordinary feeding 

 stuffs of cattle. With a certain number, notably the oil meals, x 

 the net energy values as computed by the use of his factors 

 from the amounts of protein, carbohydrates and fat actually 

 digested showed a close agreement with those found in direct 

 experiments with the respiration apparatus. The digestible 

 nutrients of these materials were of full value as compared with 

 pure starch, gluten or oil. 



TABLE 206. NET ENERGY VALUES or OIL MEALS FOR CATTLE 

 Per 100 Pounds Dry Matter 



On the other hand, a striking contrast with the oil meals is 

 afforded by the roughages, whose net energy values as directly 

 determined were much lower than those computed, the deficit 

 ranging from 30 per cent to 80 per cent and being greatest 

 with the coarsest and least digestible materials. 2 Kellner found 

 this deficit to be more nearly , proportional to the crude fiber 

 than to any other ingredient of the feeding stuffs, ranging 

 from 46.3 Therms to 76.7 Therms per 100 pounds of total fiber. 

 By subtracting the average of 61.7 Therms from the computed 

 net energy values, results were obtained which agreed well 

 with those secured in direct experiments in the case of the 

 hays but still showed considerable discrepancies for the straws, 

 as follows : 



1 Loc. cit., p. 1 60. 



2 Ibid., p. 162. 



