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Micronized Sorghum Grain. III. Energetic Efficiency for Feedlot Cattle^{1, 2,}

Oklahoma State University⁴, Stillwater 74074

Abstract

A respiration calorimetry study using 12 feeder steers in a paired feeding study was conducted to compare the energetic efficiencies of micronized sorghum (MS) and dry rolled sorghum grain (DRS) in high concentrate feedlot rations. After a 50-day feeding period, feces and urine were collected for a 7-day period and gaseous exchange measured for two consecutive 24-hr periods, using open circuit respiration calorimetry. MS had a significantly higher (P< .01) dry matter digestibility, resulting in a higher digestible energy (DE) (68.2 vs 80.0%, P < .01) content. Protein digestibility was slightly higher on MS, but the difference was not significant. Urine and methane energy losses were approximately the same for both MS and DRS. MS also had a higher metabolizable energy (61.7 vs 74.9%, P< .01) and NE_m+g (59.8 vs 70.7%, P< .05) than DRS, reflecting the higher DE content.

¹ Journal article 2780 of the Agricultural Experiment Station, Oklahoma State University, Stillwater.

² The assistance of Roger Johnson in statistical analysis is greatly appreciated.

³ Present address: Ralston Purina Co., Oklahoma City, Oklahoma.

⁴ Department of Animal Sciences and Industry.