Ce numéro regroupe des textes issus des projets ayant travaillé dans le cadre du Programme PSDR 4, sous l’égide d’INRAE et de 10 Régions françaises.International audienceAmong agroecological principles, it has been assumed that incorporating diversity into livestock farming systems could increase their multiperformance and enhance their resilience. Technical references are however still missing. The research-development project PSDR4 New-DEAL (2015-2020) provided technical and organizational knowledge on/for multi-species grassland-based systems and integrated crop-livestock systems. Research was conducted across spatial scales, from territory to system components (animal and vegetal resources and work organization), with a focus on fodder ...