Taking them off pellets will mean they have a slight drop in egg numbers untill the birds get a balanced diet from foraging.
The birds need enough protein to either produce feather or lay eggs, besides everyday energy and bodily needs.
I feed mine 3 wheat 1 cut maize 1 rolled barley, cod liver oil in winter when the light levels are low and cider vinegar, plus greens in the breeding pens for birds not able to get out on forage.
Lawn clippings are fine. I grow lots of spinach and anything in the way of weeds gets given to the birds.
I free range my growers as soon as possible, as it stops feather pecking and bordom. It gets the youngsters running about after live feed in the way of insects.
Bagged feed as far as I'm concerned contains nothing I'd want to eat myself and when you eat the eggs from birds fed on pellets your eating whatever the mills have put in it.
I run about 360 birds in 12 different breeds as near a natural life as possible, including hatching under broodies and they lay and breed perfectly well on a grain diet, as poultry does all over the world without pellets.