Nutritional Evaluation of Poultry By-Product Meal as a Protein Source for Ruminants: Effects on Performance and Nutrient Flow and Disappearance in Steers 1,2

D. W. Bohnert, B. T. Larson, M. L. Bauer, A. F. Branco, K. R. McLeod, D. L. Harmon, G. E. Mitchell

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We conducted three studies with steers to evaluate poultry by-product meal (PBM) as a supplemental N source for ruminants. An in situ study compared the solubility, degradation rate, and ruminal escape of PBM N with blood meal (BM), corn gluten meal (CGM), and soybean meal (SBM) N. Additionally, an 84-d growth study (n = 95, 228 ± 5 kg BW) and a digestion trial (6 × 6 Latin square) were conducted. The basal diet for the growth and digestion studies consisted of 49% corn silage, 36% cottonseed hulls, and 15% supplement (DM basis). Sources of supplemental N (% of total supplemental N) were 100% SBM and 0, 25, 50, 75, and 100% PBM, with urea used to balance for N. In situ ruminal escape N (25.2, 55.3, 86.7, and 98.9% for SBM, PBM, CGM, and BM, respectively) was greater (P < .05) for PBM than for SBM; however, a greater (P < .05) proportion of BM and CGM N escaped ruminal degradation compared with PBM. Dry matter intake, ADG and gain/ feed increased linearly (P < .003) as PBM increased; however, no differences (P > .48) were observed in these variables for 100% PBM compared with 100% SBM. Duodenal N flow and small intestinal N disappearance increased linearly (P < .05) as PBM increased in the diet. Bacterial N flow to the small intestine was not affected (P > .19) by treatment; however, 100% SBM decreased (P < .04) bacterial CP synthesis (g bacterial N/kg OM disappearance from the stomach) compared with O and 100% PBM. In vivo ruminal escape N of PBM and SBM was 40.6 and 13.7%, respectively. Ruminai NH3 N decreased linearly (P < .001) as PBM increased. These data suggest that PBM can replace SBM as a source of supplemental N for steer calves that consume a diet based on corn silage and cottonseed hulls.

Original languageEnglish
Pages (from-to)2474-2484
Number of pages11
JournalJournal of Animal Science
Volume76
Issue number9
DOIs
StatePublished - Sep 1998

Keywords

  • Byproducts
  • Degradation
  • Nitrogen
  • Poultry
  • Protein
  • Steers

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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