I wonder what you mean by 'crumbles', Mel? do you mean what's usually known as layers mash? I think Chris supposes you have still got them eating chick crumb, which I dont think is very likely. Layers pellets and layers mash is the same stuff, only the pellets are mash compacted into little bits so the hens have to eat everything and not pick out the bits they like and waste the rest. They do need one or the other at their age, so the extrra calcium etc in layers feed will support their egglaying, but it doesnt matter which.