Strategies for sustainable cattle husbandry and nutrition

alfalfa alimentation des animaux ammonia ammoniac animal feeding animal husbandry azote bovin calidad cattle engorde engraissement ensilado ensilage (produit) excretion fattening feed grasses fertilisation fertilizer application fixation de l'azote fosforo ganado bovino grazing income lisier lucerne luzerne metano methane milk production nitrate nitrates nitratos nitrogen nitrogen fixation pastoreo phosphore phosphorus pollution by agriculture pollution par l'agriculture potasio potassium quality reduction renta revenu rumen saison seasons silage slurry zea mays