Use of fodder trees and shrubs (trubs) in the arid and semi-arid zones of West Asia and North Africa: history and perspectives

afrique du nord aliment pour animaux arbre arbuste arbustos arid zones climatic factors constraints contrainte crop residues ecologia ecologie ecology facteur climatique feeds matorral middle east moyen orient multipurpose trees north africa nutritive value oriente medio ovin ovinos piensos plant production plantation planting production de semences residuos de cosechas scrub seed production semiarid zones sheep shrubs socioeconomic environment trees valeur nutritive valor nutritivo zone aride