I would say that in their own way most animals can communicate their desires, and to at least some degree we can infer consent or non-consent from that. Chickens tend to be protective of their eggs, so it's reasonable to conclude that they wouldn't consent to us taking them. Same with bees and honey. And certainly the same with cows and the entire process of producing dairy. In addition to the sexual assault that people do to get cows pregnant, it's well known that when baby cows are separated from their mothers, the mothers cry out loudly for their children for several days.

But again, I do agree that consent is not the only criteria. We should seek a point where our societies no longer see sentient living beings as products or commodities full stop. And I think that this commodification of thinking, living beings bleeds out and serves as the archetype of our commodification of each other, like in the way that the capitalist sees their "workers" as a form of "capital".