Copper, molybdenum, zinc and sulphur in Norwegian forages and their possible role in chronic copper poisoning in sheep

agentes nocivos aliment pour animaux alimentos para animales animal animal domestique animales animales de carne animales laniferos animals artiodactyla artiodactyle azufre bovidae bovide cinc cobre contaminantes contaminantes industriales copper crops cuivre cultivos domestic animals economic plants elements envenenamiento escandinavia europa europe facteur nuisible feed crops feed grasses feeds forraje grosero fourrage grossier ganado gramineas graminee grasses heavy metals industrial pollutants injurious factors intoxication livestock mammals meat animals metal metales metales pesados metals molibdeno molybdenum no metales nonmetals ovin ovinos plantas plantas forrajeras plante plante de culture plants poisoning polluant polluant industriel pollutants roughage rumiante ruminant ruminants scandinavia scandinavie sheep soufre sulphur toxicologia toxicologie toxicology transition elements vertebrados vertebrates vertebre zinc