916 EXPERIMENT STATION RECORD. 



chewing and digesting the protein, fat, and carbohydrates requires 10 

 per cent of their energy, and 24.1 per cent of the energy of nitrogen- 

 free nutrients is expended in fermentation. 



The amount of protein which the ration should furnish has been 

 determined and, to simplify the calculation, the energy required for its 

 digestion may be assumed to be furnished by starch. One hundred 

 grams of peanut meal contains 6.5 gm. of digestible fat and 23.5 gm. of 

 digestible nitrogen-free . extract. Deducting 24.1 per cent nitrogen- 

 free extract for the material which undergoes fermentation, the fuel 

 value of the fat and nitrogen-free extract would be 136.2 calories 

 (6.5 x 9.5+ [23.5-5.7] x 4.18=136.2); and 10 per cent of this should be 

 deducted for the labor of digesting 28.1 gm. of protein, 6.5 gm. of fat, 

 and 23.5 gm. of nitrogen-free extract. Expressed in terms of starch, 

 the nutrients are equivalent to 67.2 gm. (28.14-6.5x2.4+23.5=67.2 gm. 

 starch). Ten per cent of this would be 6.72 gm. of starch, or, expressed 

 in terms of heat, 28.2 calories. Therefore 100 gm. of peanut meal sup- 

 plies the animal, in addition to protein, with nutrients having a fuel 

 value of 108 calories (136.2-28.2 = 108). 



In the case of fodder beets the calculation is simpler, since the fat 

 content may be neglected. One hundred grams of fodder beets fur- 

 nishes 8.3 gm. of digestible nitrogen-free extract and 2.2 gm. of pure 

 digestible protein. The loss of nitrogen free extract due to fermenta- 

 tion (24.1 per cent) is equal to 2 gm., leaving 6.3 gm., equivalent to 26.3 

 calories. The 2.2 gm. of protein and 8.3 gm. of nitrogen-free extract 

 would furnish 43.9 calories, from which should be deducted 10 per cent, 

 or 4.4 calories, for labor of digestion. Therefore the 100 gm. of fodder 

 beets would furnish 26.3 — 4.4 = 21.9 calories. As a matter of fact, the 

 energy expended for digestion must be somewhat increased on account 

 of the crude fiber in the beets. However, no account is made of the 

 fat in the beets and the crude fiber in the peanut meal, so it may be 

 assumed that these factors neutralize each other. 



Taking into account what has been said, we have the following equa- 

 tion: 1,080 Y + 219 X = 6,303. The equation previously given was 

 281 Y+2.2 X—522.2. Solving the equations, Y=1.7 and X=20.4. 

 That is, a ration of S kg. of meadow hay, 1.7 kg. of peanut meal, and 

 20.4 kg. of fodder beets is sufficient for a cow weighing 600 kg. 4 months 

 with calf. 



It is evident from what has been said that the composition of proteid 

 bodies is a matter of great importance in determining their value in 

 the animal body. It is to be regretted that practically nothing is 

 known concerning the proteid bodies in coarse fodders and green feeding 

 stuffs, and very little regarding those contained in grains and oil cakes. 



