title: Use of Onion Extract as a Dairy Cattle Feed Supplement: Monitoring Propyl Propane Thiosulfonate as a Marker of Its Effect on Milk Attributes.
abstract: Onion extract is used as a feed supplement for the diet of dairy cows, acting as inhibitor of methane production; however, its properties could alter sensory attributes of milk. In this work, we propose a method to evaluate the influence of this extract on milk properties, using propyl propane thiosulfonate (PTSO) as a marker. PTSO is extracted using a quick, easy, cheap, effective, rugged, and safe procedure and monitored by high-performance liquid chromatography with ultraviolet detection. The method was applied to milk samples obtained from 100 dairy cows fed during 2 months with enriched feed. In addition, a milk tasting panel was established to evaluate the PTSO residue that should not be exceeded to guarantee milk sensory attributes. It was established that a value of PTSO lower than 2 mg kg-1does not alter milk organoleptic properties. This fact makes onion extract an interesting alternative as a feed supplement to control the methane emissions without any influence on milk attributes.
authors.affiliation: DMC Research Center S.L.U. , Camino de Jayena no. 82, E-18620 Alhendín, Spain.
authors.forename: Paloma
authors.initials: P
authors.lastname: Abad
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Granada , Campus Fuentenueva s/n, E-18071 Granada, Spain.
authors.forename: Natalia
authors.initials: N
authors.lastname: Arroyo-Manzanares
authors.affiliation: DMC Research Center S.L.U. , Camino de Jayena no. 82, E-18620 Alhendín, Spain.
authors.forename: Lidia
authors.initials: L
authors.lastname: Gil
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Granada , Campus Fuentenueva s/n, E-18071 Granada, Spain.
authors.forename: Ana M
authors.identifier: http://orcid.org/0000-0002-3191-3350
authors.initials: AM
authors.lastname: García-Campaña
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D019587:Dietary Supplements / Q000032:analysis*; D005260:Female; D008697:Methane / Q000378:metabolism; D008892:Milk / Q000737:chemistry* / Q000378:metabolism; D019697:Onions / Q000737:chemistry / Q000378:metabolism*; D009943:Organophosphorus Compounds / Q000032:analysis* / Q000378:metabolism
chemical_list: D009943:Organophosphorus Compounds; C009053:propane triphosphonate; D008697:Methane
keywords: HPLC−UV; feed flavors; milk; onion extract; propyl propane thiosulfonate