The Feasibility of using Natural Rocks as Sources of Zinc and Cobalt Inlivestock Feeding in Ethiopia. Global Journal of Science Frontier Research, [S. l.], v. 15, n. D9, p. 1–5, 2016. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/1685. Acesso em: 14 aug. 2026.