Estimating true digestibility of nonstructural carbohydrates in the small intestine of steers

A. F. Branco, D. L. Harmon, D. W. Bohnert, B. T. Larson, M. L. Bauer

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Four Angus steers (318 ± 16 kg) fitted with ruminal, duodenal, and ileal cannulas were used in a 4 × 4 Latin square design to determine carbohydrate disappearance from the small intestine (SI). Steers were fed fescue hay at 1.8% of BW and abomasally infused with starch hydrolysate (SH) at 10, 20, or 40 g/h or glucose (G) at 30 g/h. Starch hydrolysate was raw cornstarch digested by a heat-stable α-amylase. Experimental periods were 10 d with 6 d of adaptation, 3 d of digesta and feces collection, and 1 d of rest. Glucose (% of infused) had greater (P < .001) apparent small intestinal and postruminal disappearance (% of infused) compared with 20 and 40 g/h SH. Starch hydrolysate infusion linearly increased (P < .001) apparent SI, large intestinal (LI), and total intestinal starch disappearance (g/d) and quadratically increased (P < .003) apparent SI and total intestinal starch disappearance (% of infused). Ileal starch flow from infusion increased quadratically (P < .03) as SH infusion increased. True SI and total intestinal starch disappearance increased linearly (P < .001; g/d) with SH infusion. However, SH infusion quadratically decreased (P < .02) efficiency of true SI starch disappearance (% of infused). True LI starch disappearance (g/d and % of infused) quadratically increased (P < .03) as SH infusion increased. These data demonstrate that, even in animals fed all-forage diets, there is a significant flow of α-glucosides, and these need to be considered when evaluating intestinal carbohydrate digestion.

Original languageEnglish
Pages (from-to)1889-1895
Number of pages7
JournalJournal of Animal Science
Volume77
Issue number7
DOIs
StatePublished - Jul 1999

Keywords

  • Digestion
  • Glucose
  • Small intestine
  • Starch
  • Steers

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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