Yeah, and all sorts of useful byproducts for clothing, housing, lighting etc. Again sturdy beasts of burden too, perhaps more so the bulls. Indeed these quite c

Yeah, and all sorts of useful byproducts for clothing, housing, lighting etc. Again sturdy beasts of burden too, perhaps more so the bulls. Indeed these quite complex animals together with their micro-organism colonies are highly evolved to optimally convert a very basic and not very "rich" food source (grasses) into incredibly strong, docile, nourishing animals. Sure, such a 24/7 grazing-ruminating-and-digesting machinery will not evolve a grandiose brain but we can certainly work with that.