administration (1) gestion (1) cheptel sur pied (1) ordures (1) animal (1) expérience scientifique (1) effet (1) comparaison (1) taux (1) survie (1) Comparison (1) Treatment (1) Piglets (1) Synchronization (1) Survival (1) State, The (1) Sows (1) Pregnancy--Duration (1) Pregnancy (1) Political science (1) Performance (1) Parturition (1) Management (1) Livestock (1) Litters (1) Life (1) Estrus (1) Days (1) Day (1) Conception (1)