I am not 100% sure on this but in order to feather sex the parents need be a hen with fast feathering gene and a male with slow feathering gene but you get the slow feather gene in the hens to carry on but not the fast feathering in the cocks so mating siblings would not make feather sexing accurate in the offspring second generation and subsequent hatching's. Correct? I think you must use a different cock from another breeding program and then breed them together. In other words you cannot just keep breeding feather sexed birds haphazardly and maintain feather sexing as accurate.
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