But obviously, factory farm animals feel more pain than crickets. The question is just how much pain?
This paper is far from a complete answer, but it may help:
Sneddon, Lynne U., Robert W. Elwood, Shelley A. Adamo, and Matthew C. Leach. “Defining and Assessing Animal Pain.” Animal Behaviour 97 (2014): 201–12. https://doi.org/10.1016/j.anbehav.2014.09.007. Open access: https://www.wellbeingintlstudiesrepository.org/acwp_arte/69/.
This paper is far from a complete answer, but it may help:
Sneddon, Lynne U., Robert W. Elwood, Shelley A. Adamo, and Matthew C. Leach. “Defining and Assessing Animal Pain.” Animal Behaviour 97 (2014): 201–12. https://doi.org/10.1016/j.anbehav.2014.09.007. Open access: https://www.wellbeingintlstudiesrepository.org/acwp_arte/69/.