Abstract : Given global efforts towards sustainability, poultry production must find ways to optimise input use, reduce waste production and minimise energy consumption. To meet these objectives, MOLDAVI, a dynamic model simulating fluxes of C, N, P, K, Cu, Zn, water and energy at the scale of the rearing system, was developed. It is composed of an "Animal" module simulating animal performances (growth, feed consumption, excretion, heat production), a "Housing" module simulating energy production and use and gaseous emissions (H2O, CO2, NH3, N2O, N2, CH4) and an optional "Outdoor run" module simulating gaseous emissions from the proportion of total droppings excreted there. However, as there is little knowledge about rearing systems with outdoor access, experiments on two organic broiler-production systems were conducted to collect data on the quantity of droppings and gaseous emissions of NH3, N2O and CH4 in the house and on the outdoor run. Ultimately, MOLDAVI can be associated with other farm-scale modelling approaches or used in a combined approach with Life Cycle Assessment methodology.