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soybean hulls, rolled corn, feedlot, steers, minerals


The objective of this study was to determine the effectiveness of soybean hulls as an energy source for newly received feeder calves and their effects on ADG, DMI, gain/feed (G/F), morbidity rate and mineral status. Steers from a single source were blocked into previously weaned (PW; n = 63; BW = 265 ± 2.9 kg) and non-weaned (NW; n = 92; BW = 264 ± 2.4 kg) groups, then allotted to one of two dietary treatment groups. Diets consisted of either rolled corn (CRN) or soybean hulls (SBH), and oat silage and vitamin/mineral supplements. Liver biopsies and blood samples were collected at the initiation of the trial and again after 28 d on feed. Steers fed CRN had lower (P < 0.10) ADG through d 28 compared to SBH. Previously weaned steers had a higher (P < 0.10) ADG than NW steers through d 28. The SBH diets caused higher (P < 0.01) DMI through d 28 and overall. There was a diet × weaning group interaction (P < 0.10) for DMI through d 28. Cumulative feed/gain (F/G) was lower (P < 0.05) for cattle fed CRN diets. Liver Cu concentrations decreased (P < 0.01) by 22% in steers fed SBH, but were unchanged in steers fed CRN diets. Previously weaned steers had a greater loss of liver Cu compared to NW steers (P < 0.01). Liver Zn concentration was affected by a diet × weaning group interaction (P < 0.05). Morbidity rate (6.5%) was not affected by treatments. These results suggest the use of soybean hulls in newly received calf diets has the potential to stimulate DMI, and that Cu and Zn in soybean hulls may have limited availability.

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South Dakota State University


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