title: Short communication: Eicosatrienoic acid and docosatrienoic acid do not promote vaccenic acid accumulation in mixed ruminal cultures.
abstract: Previous research found that docosahexaenoic acid (C22:6n-3) was a component of fish oil that promotes trans-C18:1 accumulation in ruminal cultures when incubated with linoleic acid. The objective of this study was to determine if eicosatrienoic acid (C20:3n-3) and docosatrienoic acid (C22:3n-3), n-3 fatty acids in fish oil, promote accumulation of trans-C18:1, vaccenic acid (VA) in particular, using cultures of mixed ruminal microorganisms. Treatments consisted of control, control plus 5 mg of C20:3n-3 (ETA), control plus 5 mg of C22:3n-3 (DTA), control plus 15 mg of linoleic acid (LA), control plus 5 mg of C20:3n-3 and 15 mg of linoleic acid (ETALA), and control plus 5 mg of C22:3n-3 and 15 mg of linoleic acid (DTALA). Treatments were incubated in triplicate in 125-mL flasks, and 5 mL of culture contents was taken at 0 and 24 h for fatty acid analysis by gas-liquid chromatography. After 24 h of incubation, the concentrations of trans-C18:1 (0.87, 0.88, and 0.99 mg/culture), and VA (0.52, 0.56, and 0.62 mg/culture) were similar for the control, ETA, and DTA cultures, respectively. The concentrations of trans-C18:1 (5.51, 5.41, and 5.36 mg/culture), and VA (4.78, 4.62, and 4.59 mg/culture) were also similar between LA, ETALA, and DTALA cultures, respectively. These data suggest that C20:3n-3 and C22:3n-3 are not the active components in fish oil that promote VA accumulation when incubated with linoleic acid.
authors.affiliation: Department of Animal Science, Food and Nutrition, Southern Illinois University-Carbondale, Carbondale 62901, USA. aabugha@siu.edu
authors.forename: A A
authors.initials: AA
authors.lastname: AbuGhazaleh
authors.forename: L D
authors.initials: LD
authors.lastname: Holmes
authors.forename: B N
authors.initials: BN
authors.lastname: Jacobson
authors.forename: K F
authors.initials: KF
authors.lastname: Kalscheur
mesh_terms: D000818:Animals; D001095:Arachidonic Acids / Q000008:administration & dosage / Q000494:pharmacology; D002417:Cattle / Q000378:metabolism*; D004883:Erucic Acids / Q000008:administration & dosage / Q000494:pharmacology; D005227:Fatty Acids / Q000032:analysis; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D019787:Linoleic Acid / Q000008:administration & dosage / Q000494:pharmacology; D009829:Oleic Acids / Q000032:analysis*; D012417:Rumen / Q000187:drug effects* / Q000378:metabolism / Q000382:microbiology
chemical_list: D001095:Arachidonic Acids; D004883:Erucic Acids; D005227:Fatty Acids; D015525:Fatty Acids, Omega-3; D009829:Oleic Acids; D019787:Linoleic Acid; C050413:11-octadecenoic acid