[Housing strategies at farrowing for sows in loose housing systems: Influence on stress and production]

alojamiento de animales animal housing behaviour case de mise bas cerdas comportamiento comportamiento maternal comportement comportement maternel confinamiento contention estres farrowing pens glucocorticoides glucocorticoids granulocitos granulocyte granulocytes linfocitos logement des animaux lymphocyte lymphocytes maternal behaviour parto parturition restraint of animals sows stress tethered stalls truie