I don't know I would keep them on chick starter and wean them off of it after the moulting, Maybe?
Or there is probably some kind of supplement out there.Try www.mcmurrayhatchery.com
I put everybody back on unmedicated chick starter for the molting season and supplement free choice oyster shell for the layers. It's worked better for me than supplementing cat food.
If they need more protein you will know! They will start picking on each other and eating feathers, you'll see more fights and may even see some walking backward or ducking their heads and walking sideways.