1072 EXPERIMENT STATION RECORD. 



value of lli(^ incoiiio and outgo. From the ol)st'rvecl data the gains in 

 fat and muscular tissu(^s were calculated, as was also the energy })al- 

 ance. Detailed rec(M-ds were kept of the temperature of the stalls, and 

 all the experimental data of the metal)olism, dig(>stion, and respiration 

 experiments are recorded in detail, th(> experimental data being fol- 

 lowed by a general discussion of ivsults aiid statements of some of the 

 principal conclusions and deductions. A number of these conclusions 

 and deductions follow: 



On an average it Avas found that the steers consumed 1 kg. of water 

 per ?>.?> kg. of dry matter in the food. Of the water consumed as such 

 and in the food, -iH.H per cent was excretc^d in the feces and 29.2 per 

 cent in the urine. 



The investigations of the fuel value of iho food and excretor^^ prod- 

 ucts indicate that within wide limits it is possil)le to calculate the true 

 energ}" value of the digested food with a reasonal)le degree of accuracy. 

 In the experiments reported the fuel value per gram of digestible 

 material was calculated for a numl^er of feeding stuffs when added to 

 a maintenance ration. The values obtained were the following: Starch, 

 4,185 calories; gluten protein, 0,14:8; peanut oil, 8,821; molasses, -1,075; 

 "straw-like material,"' i. e., crude liber and nitrogen-free extract, 

 4,217; meadow haj^, 1,437; oat straw, 4,513, and wheat straw, 4,470 

 calories. 



In the different experiments determinations were made of the amount 

 of methan excreted, and the proportion of methan carbon to total 

 digestible carl)on and to carl)on of nitrogen-free extract and crude 

 fiber was calculated. On an average it was found that there was pro- 

 duced per 100 parts of digestible carbohydrates 3.14 parts of methan 

 carbon = 4. 2 parts of methan. According to the authors, the digestible 

 protein present in the ration had no direct effect on the formation of 

 methan. Fat and oil in the finely divided form in which they were 

 consumed in the ration did not produce methan fermentation. Oil 

 consumed as such in large ([uantities hindered this fermentation. 



The fuel value of the urine was determined under the different food 

 conditions of the sevcn-al experiments. In effect, the authors state 

 that the determinations made in the 44 experimental periods ijidicatc 

 that within certain bounds, as regards ])r<)teiu consumed. th(> carl)on 

 content of the urine furnishes a very nearly accurate measure of the 

 fuel value of the total dry matter of the urine. 



The "physiological- nutritive value" of the difierent feeding stuffs 

 is discussed. By this term the authors mean the amount of energy 

 which remains for the use of the body after the energy necessary for 

 the labor of chewing and digestion, or formation of uiini. is deducted. 

 The physiological nutritive value per gi-am of the different feeding 

 stuffs tested, when forming apart of a ration for maintenance and when 



