I got my golden buffs about two weeks ago from a large hatchery. they were supposed to be nine weeks old at the time. They were already on layer mash when I bought them. Two of the six are laying eggs already, but I don't see anything from the other four. Should they all be on layer, or would it be better to put them all on something like flock master and provide oyster shells for the ones that are laying? I have read here that too much calcium is not good for young birds that are not laying. I want to switch feed anyway because the stuff I got from the hatchery has pig meat and bone in it. Any suggestions, or should I just wait until I run out before I switch?