. The principles of animal nutrition : with special reference to the nutrition of farm animals . Nutrition. 476 PRINCIPLES OF /tNIM/IL NUTRITION. abolizable, so that the above difference in gross energy would corre- spond to 745 Cals. of metabolizable energy. Of the metabolizable energy of the basal ration in excess of maintenance, per cent, was recovered in the gain. If, then, the differences in organic matter consumed and in the digestibility of the basal ration had not offset some of the effect of the starch in Period 3, there would have been 745 Cals. more of metabolizable energy disp
. The principles of animal nutrition : with special reference to the nutrition of farm animals . Nutrition. 476 PRINCIPLES OF /tNIM/IL NUTRITION. abolizable, so that the above difference in gross energy would corre- spond to 745 Cals. of metabolizable energy. Of the metabolizable energy of the basal ration in excess of maintenance, per cent, was recovered in the gain. If, then, the differences in organic matter consumed and in the digestibility of the basal ration had not offset some of the effect of the starch in Period 3, there would have been 745 Cals. more of metabolizable energy disposable from the basal ration, and presumably the gain resulting from this would have been per cent, of 745 Cals., or 444 Cals. We have, then, by this method the foUowing:. Energy of Gain, Cals. Period 3 minus Period Correction for live weight. Correction for organic matter and for decreased digestibility Percentage utilization . 3752 40 3712 444 4156 ^ Kellner's results, then, assuming that the corrections are accu- rate, represent respectively the metabohzable and the utiUzable energy of the digested matter of the starch itself, while the results as computed on the preceding pages represent, as was there pointed out, a balance between the various negative and positive effects of the addition of starch. In other words, Kellner attempts to com- pute the real as distinguished from the apparent utihzation of the energy of the starch. The comparison on the opposite page of the percentages obtained in this way with those computed on p. 461 will therefore be of interest. Kellner also computes by his method the distribution of the gross energy of the digested starch in Kiihn's experiments and in his own experiments on moderate rations. As-calculated in Chapter X, pp. 325-6, the average loss of potential energy in methane was per cent, in Kiihn's experiments, per cent, in Kellner's, while none of the potential energy of the digested starch passed Digitized b
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