I believe this to be a bug, though I'm not quite sure. I understand the fodder to be for any kind of farm animal (except for pets and chickens). I have a very hungry pig, that somehow won't eat of that fodder. First I though it was just stuck and couldn't reach it. Not it's been around the feeding area for about three IT-days and it's still hungry. It even stood right before the fodder and didn't feed of it. I'm not quite sure if the sheep are feeding correctly. My sheep tends to wander off. Maybe the reason behind it is that it's looking for other food? Plus (and I don't know if it's related) the award section ingame didn't grant me having a sheep and a pig. Maybe the animals didn't register correctly?