TIL. Apparently the farmers in my parents area are a bit more picky. They made hay for the horses, and silage for the cows. The pigs get slop, grain, and any bio-trash that's available.
Oh yeah, I forgot that silage bunkers exist. Again not used in the area I grew up in. I don't know why. I don't use them in Farming Simulator, because they are buggy as shit, and the bales and silos aren't.
Edit: also, 2500 TONS‽‽ are you Australian? That must be an absolutely enormous farm.