Are you referring to --would you say the F1 of a Pure RC and SC will likely be like the research papers stated?
Here Mrs. Kaz posted good genetic info on Rose Comb, nice to confirm Rose-comb is caused by a 7.4 Mb inversion on chromosome 7 source http://www.the-coop.org/forums/ubbthreads.php?ubb=showflat&Number=107153#Post107153
Quote: If so then I would say no.
I never had a weak, crippled or "defective" chick come out of a Rhode Island Red do to comb type, and cant say that I have ever had a crippled or "defective" chick ever hatch out of any of my birds.
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I average around 90% hatch rate on all my Reds, Rose Comb, Single Comb and Rose/Single Comb Crosses.
Chris