182 PRINCIPLES OF ANIMAL NUTRITION. 
with an alkaline solution under pressure and containing 76.78 per 
cent. of “crude fiber.”” This material was added to a basal ration 
somewhat more than sufficient: for maintenance. The results as 
regards the proteid metabolism have already been considered 
(p. 121); the following table shows the effects also upon the fat 
production: 
Apparently Digested. Gain. 
Crude | Crude | N.-free |p, otei |Protein,| Fat. 
S| BS | Pet Psta| ot 
Ox H: 
Period 5 | Extracted straw..| 116 | 3129} 3351 654 157 735 
« 4 | Basal ration...... | 101 | 1083 2912 749 43 191 
Difference... ... 15 | 2047 439 | —95,| 114] 544 
Period 3 | Starch....... ....| 92] 1057] 4773] 629) 78 | 565 
‘¢ 4 | Basal ration..’....} 101 | 1083 2912 749 43 | .191 
Difference...... —9| —26| 1861 |-120] 35] 374 
Ox J: : , . 
Period 5 | Extracted straw...| 110 | 3101 | 3344 747 98 | 693 
“¢ 4 | Basal ration...... 107 | 1114 | 2895 836 33 223 
Difference...... 3|1987| 449| —s9| 65] 470 
Period 3 ; Starch........... 85 | 1105 | 4396 | 764 91 472 
«4 | Basal ration... sone 107 | 1114 2895 836 33 223 
Difference...... —22 —9 1501 72 58 249 
The varying quantities of nutrients digested stand in the way 
of a direct comparison of the results. If, however, we reckon 1 
gram of digested fat equivalent to 2.25 grams of digested crude 
fiber or nitrogen-free extract or protein (isodynamic quantities 
according to the usual method of computation), and if we further 
convert the gain of proteids into its equivalent amount of fat, on 
the same principle, by multiplication by 5.7 and division by 9.4, we 
have the results shown in the table on the opposite page. 
While no great quantitative accuracy attaches to such a com- 
putation, it is sufficient to show that the effect, produced in this case 
4a 
