DEVELOPMENT OF EFFICIENT MINERAL SUPPLEMENTATION REGIMES FOR GRAZING RUMINANTS IN THE TROPICS

Evaluation covers the period 11/77 to 6/79 and is based in part on a special evaluation (PD-AAG-215-C1) and an annual report of the contractor, the University of Florida (UOF). UOF, whose work has been excellent, has continued to emphasize development of simplified methods of assessing mineral status and needs of grazing ruminants. Liver samples from more productive animals, toward the end of the wet season, have proven the most reliable in this regard. Demonstrations have shown that weight gains can be doubled and calving percentages increased from 50% to 75% by correct mineral supplementation. There are preliminary indications of a return of at least double the investment in correcting mineral deficiencies. Some commercially produced mineral supplements showed a much lower phosphorus content than guaranteed on the labels. Misuse of mineral products must also be guarded against. Project leaders have been very successful in involving LDC"s in operational procedures and technical support. With the help of training provided by UOF, host country agencies are now administering much of the program. At the same time, the 16 participating LDC"s are in different stages of research. Transfer of management should proceed without jeopardizing continuity in this regard. UOF has sponsored several scientific meetings, and the publication of technical reports and laboratory manuals in several languages. Laboratories have been developed in Latin America, although equipment and personnel training are not yet complete and additional funds may be required. Recently, activities were expanded into Africa and Southeast Asia. Major recommendations are that the project be extended for two years to ensure continuity and that documentation be prepared for project expansion, together with the gradual transfer of project responsibilities and technology to established institutions in Latin America.