[Performance promoters: Are the uses and prohibitions fully discussed?]

acide organique additif aux aliments des animaux aditivos de piensos alemania allemagne animal growth promoters antibiotics antibiotique aves de corral azote bovin cattle cerdo excretion feed additives feed conversion efficiency fosforo gain de poids ganado bovino ganancia de peso germany nitrogen organic acids phosphore phosphorus pollution by agriculture pollution par l'agriculture porcin poultry probiotics probiotique promoteur de croissance animale promotores del crecimiento animal resistance to chemicals suecia sweden swine volaille weight gain