I have a small brood of 12 hens. They have access to laying mash all day. Each morning I give them a scoop of cracked corn and a scoop of meal worms. I repeat that in late afternoon. They have a really good sized range area for foraging. Is this enough food? Should I add anything to their diet?
Yeah, I wonder about those things too. Like you, I have my layer feed available 24/7 and they can eat that anytime they want. I throw out chicken scratch in the morning along with any kitchen scraps we might have. I have been mixing my own chicken scratch using about 40% cracked corn, 20% oats, and 20% barley, 20% wheat, and a coloring of sunflower seeds. I throw out about 3-4 cups of my scratch in the morning for my 10 hens. I guess that is too much according to some previous responses.
Last year I turned my chicken run into a composting system, and my chickens will scratch and peck for food in the compost all day long. During the summer I dump all my grass clippings in the run, along with any weeds pulled from the garden or yard. I will continue to throw leaves and wood chips in the run so I do not get too much grass clippings.
In the summertime, when the chickens are out in the chicken run compost, my commercial feed consumption goes down by almost half. They eat lots of grass clippings and I imagine they find lots of bugs in the compost. I suspect that my egg production goes down a bit when they eat so much grass in the summertime, but I still get more eggs than we can eat at home. And the chickens prefer to eat just about anything else before their commercial feed. But they seem healthy and happy out in the chicken run compost so I guess I am not very concerned.
I think if you have layer feed available 24/7, then you don't need to worry about not having enough food. Cracked corn is like cotton candy, so I prefer to feed chicken scratch with other grains mixed in. But I also feed kitchen scraps which may or may not be the best choice for their diet depending on the scraps. If we have old bread, I'll throw that out into the run in limited amounts. I guess feeding them bread might be like feeding them cake. I don't buy meal worms because of the high cost, but hear those are very good for the birds.
So, in general, I guess I would say that your birds are being well fed and if they are healthy and happy, then you don't have to worry too much. At least I don't with my birds.