My pullets are almost 9 weeks old and ready to move out with the rest of the free range adult birds. Since they can't have the layer pellets for at least 6 more weeks can I feed all the birds a "Hatch to Hen" starter crumble ? The reason I ask is the All Flock type feeds I usually use is running $15-$17 a bag and I can get the bulk "white label " H to H feed for $10 to $11 a bag. All birds are free ranges over several acres , so the feed is just made available when they want/need it. Also, is it okay to leave out a dish of crushed oyster shells for the layers or will the pullets eat it also ? -Thanks