[Availability, botanical composition, selectivity and nutritive quality of six gramineae-legumes associations under two grazing systems in the typical humid zones of Costa Rica]

arachis pintoi brachiaria brizantha brachiaria humidicola carga ganadera centrosema costa rica cultivo intercalado culture intercalaire feed grasses feed legumes grazing intensity humid tropics intensidad de pastoreo intercropping leguminosas forrajeras nutritive value stocking density stylosanthes taux de charge tropiques humides valeur nutritive valor nutritivo