Thanks for all the advice. I'm planning to let these guys free range during the day when they get older as well. I'm glad to hear from folks that maybe it's not quite as crucial as I had thought.
It's a grey area issue, i too have had the concerns and watched my birds like hawks lol but i have come to realize so many variables and things that you may not be able to control. I prefer not to go hog wild with super high protein diets, but there is a balance with it and i do think the birds being able to find their own feeds helps somewhat, even my calls are on the ground but don't free range due to predator concerns.
Mine love to just shovel in the black dirt right outside the barn doors....wish I could be satisfied with a good ole mouthful of dirt!