Could you round up, let's say, three humans and keep them in a holding area (a cage or a pen, for instance) and run tests on them, experiment on them, or even just charge people to see them? I assume you couldn't, in most cases today, as that would be a kind of slavery. But we have done this for a long time in our relationship with all other animals. At bottom, it’s a power relation: master-owner over slave-property; and so great a mind as Aristotle's thought of human slaves as someone's property without any comment as to how there might be a problem with it. It was just part of a “natural” order, seemingly.
Humans are quite different from any other animals we know of, but we have long believed we are not just "different" from all other animals but somehow better (in various ways). And most religions have justified the enslavement, destruction, and harm of all other animals by rationalizing that power relation, mainly with ideas about humans having some posited "soul" or "likeness to God(s)." It would be ironic if more “atheistic” perspectives wind up arguing against such a power relation, since it seems to be a case of some animals enslaving other animals; of members of one species who chose themselves as superior beings -- all pretty arbitrary and insanely self-important.
And then, presumably, there might be further implications to pursue, like comparisons to humans’ widespread opposition to cannibalism. If you won’t make a meal out of your favorite dog, let alone your favorite farmhand, what’s the reasoning behind making one out of a calf or a lamb? Would it seem like a blurb for a horror movie: Mary had a little lamb, And then she ate its flesh……