In vitro ruminal fermentation characteristics of gum arabic under concentrate and forage substrate conditions.

Publisher: Wiley Country of Publication: Australia NLM ID: 100956805 Publication Model: Print Cited Medium: Internet ISSN: 1740-0929 (Electronic) Linking ISSN: 13443941 NLM ISO Abbreviation: Anim Sci J Subsets: MEDLINE

Publication: Richmond, Vic. : Wiley
Original Publication: Tokyo, Japan : Japanese Society of Zootechnical Science [1999-

Digestion* ; Gum Arabic*/metabolism ; Rumen*/metabolism; Animal Feed/analysis ; Animals ; Diet ; Fermentation ; Male ; Propionates/metabolism ; Starch/metabolism

Gum arabic (GA) has potential rumen modifier functions. This is the first study to investigate the in vitro ruminal fermentation characteristics of GA. Rumen fluid was collected from ruminal fistulated wethers; rolled barley and ryegrass straw were used as substrates for concentrate and forage conditions, respectively. Besides incubating with the substrates alone (control), GA or potato starch (PS) was added at 0.2%, 1.0%, and 2.0% along with substrates. Under the concentrate substrate condition, GA treatments showed higher total gas production in 24-h incubation, but lower methane production in 24- and 48-h incubation compared with PS treatments (p < 0.05). The 1.0% and 2.0% GA and 0.2% and 1.0% PS treatments showed higher dry matter and neutral detergent fiber digestibility and lower NH 3 -N, and higher short chain fatty acid concentrations compared with the control at 24-h incubation (p < 0.05). The GA treatments also showed a lower acetate/propionate ratio than PS treatments at 48-h incubation (p < 0.01). Under the forage substrate condition, the treatment effects were not significant, except for a higher proportion of propionate with GA than with PS at 24 and 48 h of incubations. We thus concluded that GA supplement may exert potential rumen modifier effects particularly under concentrate feeding condition.
(© 2021 Japanese Society of Animal Science.)

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China Scholarship Council

Keywords: gum arabic; in vitro fermentation; rumen fluid; sheep

0 (Propionates)
9000-01-5 (Gum Arabic)
9005-25-8 (Starch)

Date Created: 20211028 Date Completed: 20220120 Latest Revision: 20230503

20230503

10.1111/asj.13651

34708482