Mine are messy too, I bought those large heavy plastic trays that washers sit on to place my feeders on that way the food that is dropped in them instead of on the ground which makes clean up easier. As for rats and mice. about all you can do is try and keep the feed areas as clean as possible and not leave them out all night.
Oats are not a complete feed for poultry it's okay to add some to their reg feed but to just feed it and nothing else is depriving them of good nutrients they need. Especially young poultry.
Heavy rubber bowls or heavy plastic ones work well for feeding. They have to be heavy to keep them from being tipped. My birds will turn over a feeder in a split second if they can.
Oats are not a complete feed for poultry it's okay to add some to their reg feed but to just feed it and nothing else is depriving them of good nutrients they need. Especially young poultry.
Heavy rubber bowls or heavy plastic ones work well for feeding. They have to be heavy to keep them from being tipped. My birds will turn over a feeder in a split second if they can.