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Representing a set of very ancient ecosystems, the Pampas Biome features peculiar flora and fauna and great biodiversity, not fully described by the science. Since the Iberian colonization, extensive livestock (beef and sheep) on native grasslands has been the main economic activity of the region. The progressive introduction and expansion of monocultures and pastures with exotic species have led to a rapid degradation and mischaracterization of natural landscapes of the Pampa. The purpose of this article is to assess the sustainability of different livestock production systems of family farmers in Rio Grande do Sul. It was used the Mesmis method for the sustainability analysis of three groups of identified production systems: CN (Natural Grassland), CN+C (Natural Grassland + other cultives) and CN + S (Natural Grassland + Soybean). A significant difference was identified (p <0.05) for “Productivity” attribute between CN + C and CN+ S systems, the first being greater than the second. For other attributes of sustainability there were no significant differences between the studied production systems. Keyword: Sustainability. Small livestock farmers. Soybean. 1 Doutora em Extensão Rural pela Universidade Federal de Santa Maria. carolinanicoloso@hotmail.com 2 Doutor em Resource Management pela University of Edinburgh, Escócia. Professor do Programa de Pós-Graduação em Extensão Rural da Universidade Federal de Santa Maria. vcpsilveira@gmail.com 3 Mestre em Zootecnia pela Universidade Federal de Santa Maria. Engenheiro Agrônomo da Associação Riograndense de Empreendimentos de Assistência Técnica e Extensão Rural. rfilho@emater.tche.br 4 Doutor em Zootecnia pela Universidade Federal do Rio Grande do Sul. Professor do Programa de Pós-Graduação em Zootecnia da Universidade Federal de Santa Maria. flfquadros@yahoo.com.br

Aplicação do Método Mesmis para Análise da Sustentabilidade de Sistemas de Produção da Pecuária Familiar em Área do Bioma Pampa no Rio Grande do Sul