Mash is like a half way house between a whole grain and a crumble here in the UK. The problem is that there is a lot of powder in a mash and of course there are still quite a few pieces of grain that can be picked out. Feeding the mash wet or fermented twice a day would be the way to do it. Since they have plenty of space to roam and forage, it is not like they need feed available all day to keep them from getting bored. I would give them no more than they can clean up in 10 mins of a wet or fermented mash twice a day. Fermenting is ever so easy by the way. Basically just soaking it and stirring it and leaving it loosely covered at room temp. for about 3 days stirring daily until it starts to bubble and smell yeasty. Then scoop some out for them, add some more mash and water to the bucket, stir, cover and come back when you need to give them more.
