[Reduction of gaseous pollutants in animal husbandry. Odour reduction by means of plant extract]

additif aux aliments des animaux aditivos de piensos ammonia ammoniac animal performance aves de corral bovin cattle cerdo deodorizing extractos vegetales feed additives feed conversion efficiency feed intake gain de poids ganado bovino ganancia de peso microclima microclimat microclimate plant extracts porcin poultry prise alimentaire (animaux) saponinas saponine saponins swine ureasa urease volaille weight gain