174 PRINCIPLES OF ANIMAL NUTRITION. 
Proteids, Fat, 
Grms. Grms. 
Digested wcsis ave s:dindiseccaghu sedis SiAsrauiehe Snares fies 10220 2100 
Proteids stored Up .......e. cee eee cece eee reece eee 936 
Proteids available for fat production......,........... 9284 
Equivalent fat (51.4 per cent.).........ccce eee e eens | cece 4772 
Total from fat and proteids. .............-2. cece e ee] neces 6872 
Actually produced by animal Adie ae nates temibea aia, aieboce 9730 
teids, but a high figure was assumed for their digestibility, and in 
computing the gain of fat by the animal no account was taken of 
the fat of the wool and of the offal. Henneberg’s final conclusion 
is that no possible errors arising from differences in the animals 
compared or from irregularities in the consumption of food can 
explain away the above result. 
Soxhlet * made similar experiments with swine fattened on rice, 
that is, on a feeding-stuff poor in proteids and fat and rich in carbo- 
hydrates, with the result that only 17 to 18 per cent. of the fat pro- 
duced could be accounted for by the digestible protein and fat of 
the food. In two experiments with the same species of animal by 
Tschirwinsky = but 43 per cent. and 28 per cent. respectively of the 
fat production could be thus accounted for. Of six experiments 
on geese by B. Schulze,t four, in which a comparatively wide nutri- 
tive ratio was used, showed that at least from 5 to 20 per cent. of the 
fat must have been produced from carbohydrates. Chaniewski § 
likewise experimented on geese and obtatined much more decisive 
results, from 72 to 87 per cent. of the observed fat production being 
necessarily ascribed to the carbohydrates. 
Recent experiments by Jordan || have shown that the dairy cow 
may likewise produce fat from carbohydrates. . In the first experi- 
ment a cow weighing 867 pounds was fed for fifty-nine days with 
food from which most of the fat had been extracted, the digestible 
* Bied. Centr. Bl. Ag. Chem., 10, 674. 
{ Landw. Vers. Stat., 29, 317. 
} Landw. Jahrb., 11, 57. 
§ Zeit. f. Biol., 20, 179. 
|| N. Y. State Experiment Station, Bulls. 132 and 197. 
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