The potential of local shrubs as feed for livestock and the mineral content of some soils and soil-licks in Central Tanzania

acacia mellifera albizia analyse de sol besoin nutritionnel browse plants calcio calcium caprin caprinos cobalt cobalto cobre contenido mineral copper cuivre fosforo goats grewia leucaena leucocephala magnesio magnesium manganese manganeso mineral content molibdeno molybdenum natural pastures necesidades de nutrientes nutritional requirements nutritive value ovin ovinos pastizal natural phenolic content phosphore phosphorus plantas de ramoneo plante d'abroutissement potasio potassium prairie naturelle selenio selenium sheep shrubs silicium silicon sodio sodium soil testing substance toxique taninos tannin tannins toxic substances valeur nutritive valor nutritivo