title: Short communication: malic acid does not promote vaccenic acid accumulation in mixed ruminal fluid with fractionated fish oil by a rumen-simulation technique.
abstract: The objective of this study was to determine whether malic acid could promote the accumulation of vaccenic acid in the rumen. The control diet was composed of a 65:35 ratio of forage to concentrate with 1% (dry matter basis) added fractionated fish oil (rich in docosahexaenoic acid), and treatment diets consisted of the control diet with added malic acid to achieve final concentrations of 10 mM (treatment 1) and 20 mM (treatment 2), respectively. The experiment was conducted with rumen-simulation equipment (Rusitec) consisting of 9 fermenters. Each treatment included 3 fermenters as replicates. After 7 d of incubation, concentrations of vaccenic acid from treatment 1 (4.38% fatty acids) and treatment 2 (4.46% fatty acids) were similar to that of the control treatment (4.51% fatty acids). The disappearance of docosahexaenoic acid was not different among the control, treatment 1, or treatment 2. These data indicated that malic acid did not promote the accumulation of vaccenic acid in ruminal fluid.
authors.affiliation: State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, PR China.
authors.forename: L
authors.initials: L
authors.lastname: Liu
authors.forename: J Q
authors.initials: JQ
authors.lastname: Wang
authors.forename: D P
authors.initials: DP
authors.lastname: Bu
authors.forename: S J
authors.initials: SJ
authors.lastname: Liu
authors.forename: S
authors.initials: S
authors.lastname: Liang
authors.forename: H Y
authors.initials: HY
authors.lastname: Wei
authors.forename: L Y
authors.initials: LY
authors.lastname: Zhou
authors.forename: K L
authors.initials: KL
authors.lastname: Liu
mesh_terms: D000818:Animals; D019149:Bioreactors / Q000662:veterinary*; D002417:Cattle; D004032:Diet; D005260:Female; D005395:Fish Oils / Q000378:metabolism*; D005766:Gastrointestinal Contents / Q000737:chemistry*; D008293:Malates / Q000737:chemistry*; D009829:Oleic Acids / Q000737:chemistry*; D012417:Rumen / Q000378:metabolism*
chemical_list: D005395:Fish Oils; D008293:Malates; D009829:Oleic Acids; C030298:malic acid; C050413:11-octadecenoic acid