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Are you feeding 27% protein? My Marans always require a large amount of protein in some form. Though animal protein has proven to be better than plant protein for them. Marans grow so big so fast they need a lot to help them along and 21% chick starter just doesn't have what they need.
Also, I would not ever add Niacin to their water. Goodness knows how big of a bird you would get from that! It probably woudl not be good for their growth since they seem to out grow their legs anyhow.
We put about 14 young roos all out in an empty big tractor the other day and I had 2 JG roos separated to grow in different pens for a while. Now that the 2 blue brothers are back together it is amazing to see how big one is (a monster really!) and the other is more normal size for their age. I forgot that the one with the Marans was getting the Sporting bird starter and the other wasn't. Huge difference in size. I will try to get a photo today. It is pretty awesome.
I am still not sure I am going to keep a blue JG roo so if anyone is wanting one, speak up now. Otherwise in a few weeks they may not be here.