The QUAE seminar aims to promote exchanges between researchers and practitioners on the dynamics of exclusion and inclusion of livestock activities, which are part of the agro-ecological transition and the sustainability of agri-food systems. On the one hand, it aims to characterise the innovations of substitution of animals by plants (soya) and biotechnology (in vitro meat and cellular agriculture). This first phase of the seminar was carried out in November and December 2019 during two study days. On the other hand, it seeks to clarify the current and possible reconfigurations of livestock farming activities that are taking place in response to societal concerns and injunctions relating to the "environmental issue" (global warming, biodiversity, etc.). This is the second phase of the seminar, which will take place in 2021 (4 study days).