tendance (1) abattoir (1) salmonelle (1) particule (1) acide (1) gène (1) chromatographie en phase gazeuse (1) ferme (exploitation) (1) effet (1) Composition (1) Genes (1) Animal feeding (1) Salmonella (1) Swine (1) Propionic acid (1) Population (1) Performances (1) Performance (1) Manufacturers' agents (1) Impact (1) Hand (1) Growth (1) Gastrointestinal system (1) Gas chromatography (1) Feeds (1) Excretion (1) Escherichia coli (1) Communities (1) Commission merchants (1) Butyric acid (1)