The present invention relates to a composition comprising a synergetic mixture of - at least one flavouring compound chosen from the group comprising thymol, vanillin, carvacrol, cinnamaldehyde, octanoic acid, heptanoic acid, diallyl disulfide, camphor, limonene, rosmarinic acid, p-cymene, and 1,8 cineole,- and - at least one organic acid chosen from the group comprising lactic acid, malic acid, benzoic acid, fumaric acid and sorbic acid or an alkali or alkaline-earth metal salt thereof. Moreover, the present invention relates to the use of said composition as a preservative for animal foodstuffs and additives intended preferably for monogastric animals.La présente invention concerne une composition comprenant un mélange synergétique darômes ou de substances aromatisantes et dacides organiques. De plus, la présente invention concerne lutilisation de ladite composition en tant quagent de conservation pour lalimentation animale et des additifs prévus de préférence pour des animaux monogastriques.