Quote: The calcium blows out their kidneys.
parakeet and other grits in the pet store has calcium in it too. You are supposed to switch them to grower during the molting season and for Roosters. When a hen is not laying eggs, the calcium in the feed can hurt their kidneys too. The problem where I live is that the feed stores stop carrying grower during the winter, so I have to special order it.
I like the idea of using Grower and leaving extra calcium out for the ones that want it.
Could eating layer and calcium chips in the coop do the same thing to a ROO?
Yes, but it takes a long time. It is not recommended to use layer with Roos. Use Grower with free choice calcium for breeder pens.
It is like the chicks, some Roos seem to do fine for years, others will die on you without explanation.