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Hopefully someone with genetic knowledge can sate my curiosity on this subject. If two purebred lines are crossed and then their offspring are crossed and their offspring's offspring are crossed and so forth, how many generations will have some degree of heterosis/hybrid vigor? Or rather...

I am curious as to how much time and effort would be required to establish the slow feathering trait in a flock for the purpose of crossing to produce feather sexable chicks. Also, how common are such flocks? I'll likely never be able to do it but I'm curious nonetheless.