I wouldn't. For many years I started chicks on chick starter and when the 50 lb bag ran out, they got switched to the layers pellets with the rest of the chickens. I noticed that I would have a couple random deaths of seemingly healthy birds when they were around 5 months of age and I never thought anything about it until this year. I lost a very promising bird, and started to make the connection that this has happened before.
I came to BYC and asked questions trying to figure out what happened. No one seemed to know, until one person asked me what I was feeding them. I explained and I was told it was the extra calcium that killed them. Some birds will do ok and make it, but for others, the stress on their bodies is just too much. I can't remember the whole process of what the extra calicum does to them, but I think it was basically organ failure that killed them.
I lost a total of 6 birds out of 22 that I raised this way. To fix the problem, I was told to switch to an 'all flock' feed and to keep a calicum supplement on the side for the laying hens. They will all eat the 'all flock' feed, but only the laying hens will pick at the calicum. Chickens are smart like that (or least I am told) and I believe it because I never see the roosters or young birds picking at the calcium, only the laying hens.