If you don't want to keep dry feed out all day, fermenting whole grain feed might be a good option, too. I recently began doing this because my girls seemed to be losing interest in their dry feed and they gobble it up! Plus it stretches my bags of feed out by about 30+%.
Just lay out scoops morning and night and they absorb a ton of extra nutrition since the feed is essentially pre digested and full of probiotics that make nutrients far easier to process.
For sure they need dry feed available throughout the day, but this is a great alternative too!