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Kim, I wish I had of went ahead with the Marans study to eliminate some of the unknown with the Marans.
I would like to see what would happen with a mating if a tested proven clean male was used over a tainted female showing Carnation. I would then put a pullet out of this back with the male and put a cockerel back with the tainted female. I still think where it manifest itself is when we start breeding the off spring back with the original pair.
Something to keep in mind also is that the Carnation has nothing to do with the SPRIG, something else all together.
When the Comb showed up this year in your Marans what were the relations to each other. Why not breed one of the Carnation comb birds to another Variety of Marans you have that the comb has not showed up in.
Wish I could tell you something for sure, I have ideas and wish there was a way to prove them correct or not. There definitely needs to be a study done on this and documented. You will find that most will deny having this problem. I bought one dozen eggs lthis year off
ebay and two of the chicks had Carnation comb and were Wheaten.
I wish you luch with this.
I can tell you, and save you much time. Breed a CLEAN MALE to a CARNATION COMBED FEMALE = CARNATION COMBED OFFSPRING
If you put one of these back with the clean male, you will have CARNATIONS
If you put a CARNATION MALE BACK WITH CARNATION MOM = DOUBLE DOSE CARNATIONS!
Been there, done that, got the stupid birds to prove it!
Look at the pics above.