MANUAL OF OATTLE-FEEDING 191 



That is, the amount of fat yielded by the decomposition 

 of the albuminoids was sufficient to supply what was 

 needed for the vital processes, and the extra amount added 

 was stored up in the body. This is generally expressed by 

 saying that the fat produced from the albuminoids is more 

 easily oxidized than that of the food, or, in other words, 

 that the protein protects the fat from oxidation, but there 

 seems to be no absolute proof that such is the case. There 

 is simply an excess of fat present over that required, and 

 this excess is laid up against future needs. The fat pro 

 duced from the albuminoids is always to be added to that 

 given in the food in estimating the effect of a fodder. If 

 much protein is fed, the protein consumption in the body 

 will be great, and while little or no organized protein is 

 produced, large quantities of fat may be laid on. A too 

 great accumulation of circulatory protein, however, is to 

 be avoided, since it increases the rapidity of the circulation 

 of fluids in the tissues, and tends to produce a more rapid 

 oxidation. 



§ 5. Feeding with Peojcbin and Carbhydbates. 



The only really scientific experiments on this point are 

 by Pettenkofer & Yoit,* who, as we have seen, do not be- 

 lieve in the possibiHty of a formation of fat from carbhy- 

 drates. The experiments and results now to be given form 

 a powerful argument in favor of the correctness of their 

 view in its application to the animal experimented on. 

 At the same time we must not forget that other experi- 

 ments strongly indicate that, in some cases, fat is formed 

 directly from carbhydrates. 



* ZeitschriXt f Biologie, IX , 435. 



