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The fatal gene typically only happens when mating two short legged Japs together and 25% of those chicks won’t survive to hatch. The breeding of a short leg to a longer legged one will not result in this, but will yield more long legged chicks than desired.So i own 1 jap mottled roo bantam abd he breeds my standard hens. I've seen bulls-eye in yolk plus seem his offspring that wwere almost completely feathered but never hatched..I think me not having successful hatch rate is the short leg trait and mixinh him with with standard hens?
Yes, I have only hatched bantam eggs. My standard eggs never hatch. They have chicks inside I have looked after it was obviously too long and not alive. Still had yolk but otherwise looked fully developed. Hes only rooster with the standards i have two show chickens (one hen one roo,) in their own run by themselves.The fatal gene typically only happens when mating two short legged Japs together and 25% of those chicks won’t survive to hatch. The breeding of a short leg to a longer legged one will not result in this, but will yield more long legged chicks than desired.
So it should not be a factor with your standard hens, I’d be looking at other reasons like incubator problems or likewise. Is he your only rooster? Have there been any live chicks?