How I think about anti-speciesism seems to be that if some creature is at or above some threshold for caring about, its welfare is an end in itself and abusing them is unconscionable. Where I set the bar for “worth caring about” may shift overtime, but that there is a bar or threshold seems central to how I feel about this. There isn’t a ceiling though. Two different species above the threshold may differ in how much I weight their relative well-being, though. So, I could value one human as equal to an arbitrary number of chickens, but there’s still duties not to commit certain kinds of harm to chickens like raising and killing them under torturous conditions so we can eat them. I don’t know if this technically makes me speciesist or not. My intuitions seem more deontologist than consequentialist, or are at least negative-leaning.