That's fine. They just need to be able to farm well enough on their own. They don't need to be sentient or anything... in fact, I'd advise against it.

Humans won't be the dominant race on every world, nor will Earth exist in a number of universes. Then, there's the issue of how stable the world is, even if humans are at the top, and have the same sorts of food that we do.

True. But a number of them can be manufactured easily enough... it's mostly intellectual properties that we'd lack.