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http://dx.doi.org/10.5187/JAST.2006.48.4.521

Effect of the Level of Carbohydrates on Bio-hydrogenation and CLA Production by Rumen Bacteria When Incubated with Soybean Oil or Flaxseed Oil In vitro  

최성호 (Department of Animal Science, Chungbuk National University,)
임근우 (Department of Animal Science, Chungbuk National University,)
김광림 (Department of Animal Science, Chungbuk National University,)
송만강 (Department of Animal Science, Chungbuk National University,)
Publication Information
Journal of Animal Science and Technology / v.48, no.4, 2006 , pp. 521-532 More about this Journal
Abstract
An in vitro study was conducted to examine the effect of addition level of carbohydrates on fermentation characteristics, and bio-hydrogenation of unsaturated fatty acids by mixed rumen bacteria when incubated with soybean oil or flaxseed oil. Four levels(0%, 0.3%, 0.6% and 0.9%, w/v) of the mixed carbohydrates(glucose, cellobiose, soluble starch, 1:1:1, in weight basis) and oil sources(soybean or flaxseed oil, 60mg in 150ml culture solution) were added to the mixed solution of strained rumen fluid with artificial saliva(1:4, v/v), and incubated anaerobically for 12 hours at 39℃. pH and ammonia-N concentration were lower by increasing the substrate levels at all incubation periods(P<0.05~P<0.001). The propionate proportion increased(P<0.001), but acetic acid and butyric acid decreased(P<0.001) with the substrate level at 6 and 12 h incubations. Oil sources did not influence the proportions of individual VFA. At the end of incubation, the proportions of C18:0(P<0.01), C18:1(P<0.001) and trans-11C-18:1(P<0.01) were reduced but those of C18:2(P<0.001) and C18:3(P<0.01) were enhanced by the addition of flaxseed oil compared to addition of soybean oil. The proportions of C18:0 and total CLA were reduced(P<0.01) but those of trans-11-C18: (P<0.05) and C18:2(P<0.01) were increased with the substrate level when incubated with soybean oil or flaxseed oil. There were interactions(P<0.05) in the proportions of C18:1, C18:2 and C18:3(P<0.01) between oil source and substrate level. The proportions of cis-9, trans-11-CLA and trans-10, cis-12-CLA tended to reduce with substrate level, although there was no significant difference between treatments.
Keywords
CLA; Rumen microbes; Bio-hydrogenation; Flaxseed oil; Soybean oil; In vitro;
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