I have heard/read that extra protein makes chicks grow faster (i.e.- necessary when growing broilers), so I was wondering if extra protein would help these runty chicks? It would make sense at least that it could help their feathering, since I read that chicks without enough protein in their diet won't feather out correctly, and may even turn cannibalistic to get the protein they need.
Maybe these runts have a digestive problem (enzyme deficiency, need a probiotic, etc) whereas they are not properly digesting/absorbing the protein, so that on the same high quality diet as their coop mates, they still are not getting as much nutrition?
I am experiencing this problem as well. I have seven black Australorp chicks, all hatched March 30th. The two roos (all were supposed to be hens) were noticeably smaller after about a week, and the one feathered out more slowly but is still pretty much "clothed" now. But the little runt is still a little fuzz butt. Has some wing feathers but barely anything else. All the others like to show off and fly and he can't even leave the ground, poor kiddo! He is very active and bright and alert, no signs of illness otherwise. I was wondering if maybe it just took him a little longer to get out of the egg as a hatchling? I keep them inside at night still because of him! The others had more feathers at 2 weeks than he does now at over 6 weeks.
Sorry to hear that I am not alone on this problem, but it is good to know that there is not necessarily something that I did or messed up to cause this.
I am thinking I might try to feed him "game bird starter", which usually has higher protein of 24 to 28%. Thoughts? :-/