Agro-industrialization together with consolidation processes between agribusiness entities, especially between agricultural production and agri-food sector, make the analysis of coordination processes between farmers (producers’ organizations) and food sector an important research issue. The goal of this paper is thus to provide characteristics for modes of transaction coordination between poultry producers’ organizations and their buyers taking into a special account formal/contractual relations. For the purpose of the research the author applied a questionnaire method which was conducted between March and May 2015. The sample was 67 poultry producers’ organizations covering their activities in the year 2014. Conducted research revealed that 73% of respondents sold the whole production of their members to processing plants and most transactions of poultry producers’ organizations were completed under contractual framework.