Isotope aided studies on livestock productivity in Mediterranean and North African countries : proceedings of a final research co-ordination meeting on optimizing grazing animal productivity in the Mediterranean and North African Regions with the aid of nuclear techniques organized by the joint FAO/ IAEA Division of Isotope and Radiation Applications of Atomic Energy for Food and Agricultural Development and Cooperazione Italiana Allo Sviluppo held in Rabat from 23 to 27 March 1987. (Panel proceedings series, 1988)