Measuring the secondary production of pasture - an applied example in the study of an extensive production system in Mali

africa africa de habla francesa africa south of sahara afrique afrique au sud du sahara afrique francophone afrique occidentale chemicophysical properties digestibilidad digestibility evaluation facteur de production francophone africa grazing lands land mali methode methods nutritive value organoleptic properties palatabilidad palatability pastizales pastures production factors sahel terre tierras tierras de pastoreo valeur nutritive valor nutritivo west africa