We can no more justify using nonhumans as human resources than we can justify human slavery

We can no more justify using nonhumans as human resources than we can justify human slavery. Animal use and slavery have at least one important point in common: both institutions treat sentient beings exclusively as resources of others. That cannot be justified with respect to humans; it cannot be justified with respect to nonhumans—however “humanely” we treat them.
~ Gary L. Francione (March 7, 2010)