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Replace never with rarely (maybe even very rarely) otherwise role of mutations and their repeated occurrence is discounted.
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From what I have seen, the locus / loci coding for single comb and rose comb phenotypes are not the same as those promoting narrow combs, hollow centers or fewer points. Other loci are involved. Effects of those other loci only detectable when played out with rose comb phenotype. You simply must have the rose comb phenotype operating to cull out the alleles that are undesirable when interacting with the rose comb.
Body type will not be degraded by change of comb type alone. Comb type is a function of relatively few genes that are not shown to be same as any influencing body type. Degrading of body type can be done independently as a result of poor selection of brood animals for body type.
Replace never with rarely (maybe even very rarely) otherwise role of mutations and their repeated occurrence is discounted.
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From what I have seen, the locus / loci coding for single comb and rose comb phenotypes are not the same as those promoting narrow combs, hollow centers or fewer points. Other loci are involved. Effects of those other loci only detectable when played out with rose comb phenotype. You simply must have the rose comb phenotype operating to cull out the alleles that are undesirable when interacting with the rose comb.
Body type will not be degraded by change of comb type alone. Comb type is a function of relatively few genes that are not shown to be same as any influencing body type. Degrading of body type can be done independently as a result of poor selection of brood animals for body type.