[Different diets for each productive phase [of swine]]

aliment pour animaux alimentation des animaux alimentazione zootecnica alimenti per gli animali amino acids animal feeding besoin nutritionnel cerdo crecimiento crescita croissance destete diet dieta energy value environmental impact faeces feces feci feeds growth heces impact sur l'environnement impacto ambiental impatto ambientale liquami liquid manures materias primas materie prime necesidades de nutrientes nutritional requirements nutritive value piensos porcin purin raw materials sevrage svezzamento swine valeur nutritive valor nutritivo valore energetico valore nutritivo weaning