Intake and ruminal fermentation by beef steers consuming prairie hay with supplements containing combinations of corn, soybean hulls, soybean meal and urea

G. C. Duff, M. L. Galyean, K. J. Malcolm-Callis

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Twelve ruminally cannulated beef steers (408±17.2 and 418±15.4 kg initial and final body weight, respectively) fed prairie hay were used to evaluate the effects of substituting soybean hulls for one-half the corn in a urea-based protein supplement on forage intake and ruminal fermentation during two periods. Treatments (three steers treatment-1) were no supplement (CON), corn plus soybean meal (CS), CS plus urea (CU) and CU plus soybean hulls (SU). Urea provided approximately 35% of the total crude protein (CP) for the CU and SU supplements. Supplements were fed at approximately 145% of maintenance CP requirements. Periods consisted of 14 d for adaptation to the supplement and 7 d for intake measurements. On d 22 of each period, ruminal samples were collected at 0, 0.5, 1, 2 and 4 h after supplementation. Following the 4-h sample, ruminal contents were removed for determination of dry matter (DM) fill and indigestible acid detergent fiber (IADF) passage and fill. Forage and total DM intake did not differ (P>0.10) among treatments. Passage rate of IADF was greater (P<0.10) for CS than for the average of CU and SU. Ruminal DM fill and IADF fill were greater (P<0.10) for the average of CU and SU than for CS. Ruminal pH was not affected (P>0.10) by treatments. At 0.5 h after supplementation (treatment x sampling time, P<0.10) acetate was increased (P<0.05) for CS vs. the average of CU and SU. Across sampling times, propionate was increased and the acetate:propionate ratio was decreased (P<0.10) for the average of CU and SU vs. CS. Ruminal ammonia concentration was increased (P<0.10) by supplements compared with CON at all sampling times. Ammonia concentration was greater (P<0.01) for the average of CU and SU than for CS at 0.5, 1 and 2 h after supplementation, and increased (P<0.10) for SU vs. CU at 0.5 h, Results suggest that soybean hulls can replace corn in urea-based protein supplements without adversely affecting intake or ruminal fermentation, albeit no benefits were noted from the substitution.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalJournal of Applied Animal Research
Volume9
Issue number1
DOIs
StatePublished - Mar 1996

Keywords

  • Beef cattle
  • Forage
  • Protein supplements
  • Rumen fermentation

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