title: Influence of fresh alfalfa supplementation on fat skatole and indole concentration and chop odour and flavour in lambs grazing a cocksfoot pasture.
abstract: We investigated the influence of the level of fresh alfalfa supplementation on fat skatole and indole concentration and chop sensory attributes in grazing lambs. Four groups of nine male Romane lambs grazing a cocksfoot pasture were supplemented with various levels of alfalfa for at least 60days before slaughter. Perirenal fat skatole concentration was higher for lambs that consumed alfalfa than for those that consumed only cocksfoot. The intensity of 'animal' odour in the lean part of the chop and of 'animal' flavour in both the lean and fat parts of the chop, evaluated by a trained sensory panel, increased from the lowest level of alfalfa supplementation onwards and did not increase further with increasing levels of alfalfa supplementation. The outcome of this study therefore suggests that these sensory attributes may reach a plateau when perirenal fat skatole concentration is in the range 0.16-0.24μg/g of liquid fat.
authors.affiliation: Institut National de la Recherche Agronomique (INRA), UMR1213 Herbivores, F-63122 St-Genès-Champanelle, France; Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 7712, CEP 91501-970 Porto Alegre-RS, Brazil.
authors.forename: T
authors.initials: T
authors.lastname: Devincenzi
authors.affiliation: Institut National de la Recherche Agronomique (INRA), UMR1348 Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Élevage, F-35590 St-Gilles, France.
authors.forename: A
authors.initials: A
authors.lastname: Prunier
authors.affiliation: Institut National de la Recherche Agronomique (INRA), UE1206 Elevage Alternatif et Santé des Monogastriques, Le Magneraud, F-17700 St-Pierre-d'Amilly, France.
authors.forename: K
authors.initials: K
authors.lastname: Meteau
authors.affiliation: Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 7712, CEP 91501-970 Porto Alegre-RS, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Nabinger
authors.affiliation: Institut National de la Recherche Agronomique (INRA), UMR1213 Herbivores, F-63122 St-Genès-Champanelle, France. Electronic address: sophie.prache@clermont.inra.fr.
authors.forename: S
authors.initials: S
authors.lastname: Prache
mesh_terms: D000821:Animal Feed; D000818:Animals; D031745:Dactylis; D019587:Dietary Supplements; D007211:Indoles / Q000032:analysis*; D008055:Lipids / Q000032:analysis*; D008297:Male; D008460:Meat / Q000032:analysis / Q000592:standards; D000455:Medicago sativa; D009812:Odorants; D034561:Sheep, Domestic; D012862:Skatole / Q000032:analysis*; D013649:Taste
chemical_list: D007211:Indoles; D008055:Lipids; C030374:indole; D012862:Skatole
keywords: Alfalfa (Medicago sativa); Lamb; Off-flavour; Sensory analysis; Skatole; δ15N