J. Anim Sci.
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J. Anim Sci. 1973. 37:790-795.
© 1973 American Society of Animal Science
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A Comparison of Energetic Efficiency of Dry Rolled and Reconstituted Rolled Sorghum Grain by Steers Using Indirect Calorimetry and the Comparative Slaughter Technique1

H. E. Kiesling2, J. E. McCroskey3 and D. G. Wagner

Oklahoma Agriculture Experiment Station, Stillwater 74074

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.

Footnotes

1 Journal Article 2447 of the Agricultural Experiment Station, Oklahoma State University, Stillwater.

2 Present address: Taylormade Feeds, Las Cruces, New Mexico, 88001.

3 Present address: Department of Animal Industries, University of Idaho, Moscow 83843.






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Copyright © 1973 by the American Society of Animal Science.