This review intends to bring an overview of relevant challenges and accomplishments surrounding the farm animal welfare fi eld and identify gaps that, when fulfi lled, may lead to positive outcomes in the present, but especially for the future of the pork and poultry industries. It is not new to animal agriculture sectors, governments, animal protection organizations, and consumers that animal welfare concerns surrounding current industrialized animal production systems have increased within the last decade. Globalization, international trade, and dramatic increases in the demand for animal protein for decades to come may magnify these concerns from both practical and ethical perspectives and thus create a need for objective debates. Within this global scenario, a major challenge for all parties ought to be implementing a “clean, green, and ethical” animal agriculture, while guaranteeing that food is produced under high animal welfare standards. Sound and objective science must be the basis for establishing on-farm and slaughter standards seeking to promote better animal welfare. Currently, integrating these standards and guidelines may not be a priority for a cluster of leaders in animal production and even for policymakers, as changes are usually associated with signifi cant fi nancial and time investments. Hence, resistance arising from this confl ict may weaken opportunities for forthcoming implementation of science-based welfare-friendly production and slaughter practices. Some progress toward improving animal welfare has been observed in situations which these standards are either legislated, verifi ed under a third-party certifi cation program, or are a trade barrier by the importing market where the priority is likely economic benefi t (Promar International, 2008; Centner, 2010; Rayment et al., 2010). Direct enforcement and application of penalties for nonconformance to legislated animal care and treatment standards and policies may also be a challenge due to costs of putting infrastructure changes (building or retrofi tting) into practice and the lack of resources and trained professionals (Promar International, 2008; Rayment et al., 2010). Thus, in the authors’ opinions, one of the greatest challenges facing the scientifi c communities in the upcoming decades will be to uncover solutions while reconciling the need to safeguard animal welfare within a sustainable farm animal production system, and considering public and governmental deliberations for ethical treatment of animals. The readiness to overcome these challenges is highly dependent upon consideration of societal moral and ethical values and their infl uences in driving political and economic policy amendments in countries leading animal production. Two distinct economic and socio-political nations’ categories, that may or may not refl ect consumer general principles and concepts toward animal welfare, are witnessed globally. One category consists of industrialized developed countries, which are featured by a population that spends a minor portion of its household income on food, The Five Freedoms in the global animal agriculture market: Challenges and achievements as opportunities