478 



Journal of Agricultural Research 



Vol. Ill, Xo. 6 



the clover hay \nth which it was fed, while in experiment 21 1 it was 

 apparently distinctly greater than that due to the mixed hay con- 

 sumed with it. Grain mixture No. i decidedly exceeded timothv hay 

 in this respect, and grain mixture No. 2 was nearly equal to alfalfa hay. 

 As a matter of fact, however, these results are in general harmonv 

 with those of other investigators, particularly Kellner. The senior writer 

 (2, p. 492) pointed out some 12 years ago that the total expendi- 

 ture of energy consequent upon feed consumption, as computed from 

 Kellner's published experiments, is strikingly uniform for the several 

 materials experimented upon with the exception of wheat gluten, the 

 average results computed per kilogram of dry matter being quite of the 

 same order as those here reported, viz: 



Average energy expenditure per kilogram of dry malter 



Calories. 



Meadow hay i, 254 



Oat straw 1,014 



Wheat straw i, 138 



Extracted straw i, 160 



Starch; 



Kiihn's experiments i, 508 



Kellner's experiments — 



Moderate rations i, 248 



Heavj' rations 903 



Kellner's later experiments (24, ed. 6, p. 160-168) have not yet been 

 published in full, so that it is not possible to make an exact computarion 

 of the energy expenditure. In certain cases, however, the percentages 

 of digestible nutrients are reported. If the corresponding amount of 

 metabolizable energy be computed, using the factors given on page 453, 

 and from this the amount of energ)' gained by the animal subtracted, 

 the difference will represent approximately the energy spent in digestion, 

 etc. The results of such computations are as follows: 



Energy expetiditure per kilogram of dry matter, computed from Kellner's experiments 



Calories. 



Peanut oil " i, 727 



Wlieat gluten : 



Ktihn's experiments 2,558 



Kellner's experiments 2,096 



Beet molasses ■ 988 



Feeding stuff. 



Cottonseed meal 

 Peanut meal . . . 

 Palm-nut meal. . 

 Linseed meal. .. 



Barley straw . . . 



Clover hay 



"Grass hay". .. . 

 Rowen 



Gain ia 



energy by 



animal. 



Calories. 

 1,869 

 1,798 



1.739 

 1,828 



747 

 811 

 803 

 747 



Energy 

 expended 

 in feed con- 

 sumption. 



Calories. 



719 

 890 



757 

 932 



877 

 932 



1.045 



958 



The approximate results thus computed for the coarse fodders are 

 comparable in a general way with ours upon similar feeds, although 



a One veri' high result was rejected. 



