stress (1) science (1) persistance (1) plomb (1) aliment (1) ferme (exploitation) (1) environnement (1) abords (agglomération) (1) Development (1) Food (1) Control (1) Observations (1) Observations (1) Animal feeding (1) Zoo animals (1) Swine (1) Sows (1) Social sciences (1) Science (1) Weight loss (1) Process (Law) (1) Persistence (1) Performance (1) Operant conditioning (1) Nature and nurture (1) Meal (1) Manufacturers' agents (1) Lead (1) Ingestion (1) Hypothesis (1)