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Energy Values of Corn, Bird-Resistant and Non-Bird-Resistant Sorghum Grain in Rations Fed to Steers¹

University of Florida,³ Gainesville 32601 and Agricultural Research Center, Jay 32565^,4

Abstract

Total digestible nutrients, metabolizable energy (ME), and net energies for maintenance (NE_m) and gain (NE_g) were compared in corn, non-bird-resistant (NBR) and bird-resistant (BR) sorghum grain rations when fed to steers. The corn, NBR and BR sorghum grains had 3.21, 2.63 and 2.49 Meal of ME energy per kilogram on the dry matter basis, respectively. NE_m values for the grains were 2.40, 1.98 and 1.78 Mcal per kilogram and the NE_g values 1.49, 1.15 and 0.73 Mcal/kilogram dry weight when the corn, NBR and BR sorghum rations were fed ad libitum, respectively. The gross energy (GE), ME, NE_m and NE^g values determined for the corn, NBR and BR sorghum grains were used for predicting gains by the N.R.C. and the A.R.C. systems; rates of gain were predicted and compared with those actually obtained in the feedlot. The predicted gains for the steers fed ad libitum using the N.R.C. system agreed with those actually obtained within 0.08 kg per day. Predicted gains by the A.R.C. system were within 0.01, 0.23 and 0.12 kg of that observed for the corn, NBR and BR diets fed ad libitum, respectively. When the N.R.C. (1970) NEm and NEg values for sorghum grain were used for the BR sorghum grain, the predicted gains were 0.45 kg per day greater than actually observed. This difference indicates that the N.R.C. values for sorghum grain are too high when using a BR sorghum grain of the type used in this study.

¹ Institute of Food and Agricultural Sciences Journal Series No. 4871.

² Present address: Murphy Products Company, Burlington, Wisconsin, 53105.

³ Animal Science Department.

⁴ The writers wish to thank J. W. Carpenter and J. S. Scott for technical assistance in this investigation.

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