Fattening pigs on deep bedding

ammonia ammoniac animal litter besoin en main d'oeuvre cama (animales) carbon dioxide carcass composition cargas variables cerdo charge fixe charge variable composition de la carcasse costos fijos crianza en cama profunda deep litter husbandry demanda de trabajo dioxyde de carbone diptera dust feed conversion efficiency fixed costs gain de poids ganancia de peso humedad humidity labour requirements main d'oeuvre mano de obra manpower polvo (contaminantes) porcin seasonal variation swine temperatura temperature variable costs weight gain