A Comparison of Energetic Efficiency of Dry Rolled and Reconstituted Rolled Sorghum Grain by Steers Using Indirect Calorimetry and the Comparative Slaughter Technique

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Abstract
Respiration calorimetry and the compartive slaughter technique were used to compare the energetic efficiency of feedlot rations containing dry rolled (DR) and reconstituted (38% moisture) rolled (RR) sorghum grain for yearling steers. The study included a feedlot phase and two total energy balance trials, one prior to and one immediately following the feedlot phase. In the feedlot phase, dry matter intake was lower (P<.05) while net energy (NEm+g) was greater (P<.01) for the RR grain ration when determined by the comparative slaughter technique. During the energy balance trials steers fed the RR grain ration consumed less (P<.001) gross energy but tended to be more efficient in energy utilization. Digestible energy was higher (P<.01) in trial 1 and metabolizable energy was higher (P<.01) in trial 2 for the RR grain ration. No significant difference in NEm+g between rations was observed in either trial. A comparison of the two methods for measuring energetic efficiency revealed that NEm+g values for both rations were 22% higher (P<.001) when determined by the respiration calorimetry than by the comparative slaughter technique. Copyright © 1973. American Society of Animal Science . Copyright 1973 by American Society of Animal Science.

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