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By the way, I've yet to research the genetics, and have no cushion combed birds of my own; however I think I've read somewhere that the cushion, walnut, and pea combs are all related.................................. and know that pea combs can get sloppy and start to resemble a walnut comb; or start to loose defination in the three rows of ridged peas and begin to resemble a wrinkled cushion comb. I think Ryan [Minnesotachickenbreeder] is a new owner of a flock of the rare McGraws, and may have knowledge of the relationship between cushion and pea combs if it exists........................... I've read that the Mcgraws have both occurring in the breed.
Cushion, walnut, and strawberry combs are all based on the genotype R/R P/P (when homozygous) the smooth and rough modifiers are what changes the appearance of them. I have recently bred a Wyandotte cross rooster to some EE hens and now have some cushion combed offspring from them, it will be interesting to see what shape and how big the combs are when they mature. Their comb genotype is R/r+ P/p+. The McGraws with cushion combs have a very low and short in length comb comb compared to my project birds which combs are thiner and longer. I assume this is due to my McGraws currently being R/r+ P/P.