My gals are just over 5 months old.1 BR 1 Buff Orp,and 1 EE . No one has laid an egg,yet.I'm feeding them about 6 diffrent grains.But no layer feed,they freerange about 3 hrs, a day.They seem in good health.They get fish and vegg.Oyster shells and grit free choice.How important is layer feed.and should I add it? ANY HELP !