Maybe increase their protein content?
All the chicks are getting 30% protein until I can tell which are pullets. The pullets are getting 20%, cockerels 30%. The disparities are showing up in the "too young to separate" pens, so I don't think feed is the issue. They are not cannibalizing each other, either.
Some color patterns like barring require slow feathering to get the sharp contrast between colors. Not sure about lacing.
Not sure about whether lacing needs slow feather growth either, which is why I posted here.
Exactly! Some of the naked chicks are female, some male, all 3 colors and scattered amongst different weeks' hatches. A few of the chicks are fully feathered with decent tails by 4 weeks of age. Most are decently feathered by 6-7 weeks of age. Last week I culled a 6 week old chick that only had wing feathers, but it wasn't growing frame or muscle either. I called it "failure to thrive." I do not have brooder space for keeping chicks under heat until they are 8-10 weeks old. I also don't want the little boogers to sunburn, which is a bigger problem most of the year here. I'll try to be patient and not cull the half-nude birds until they give me a second reason to put them in the freezer.I did notice that you wrote very slow feathering in SOME chicks.
I cannot think of any reason that slow feathering would be an advantage in this variety.
Best wishes,
Angela