I have also read that they are difficult to hatch, but that is the best picture I have ever seen of oneSo I bought 12 cream legbars to hatch and managed to get two double yolkers. I know they are hard to hatch but I have no choice but to give them a shot. Wish me luck'[/URL]
Thanks for that explanation. I have read that they seldom hatch, but never had such a good explanation of why, and the long term effectsX2 on the good picture. It may be cool but avian embryos (or any egg laying species) don't have the same advantages as live bearers like mammals. These are just my thoughts that you can take with a grain of salt. (Salt that should go on those sunny side up double yolkers.)
There's a finite amount of space and nutrition unlike with mammals. There isn't twice the space or twice the nutrition. The yolks are usually smaller and less albumen.
If by some miracle they hatch, there will be long term effects from that. I understand the desire of some to experiment with twinning but If one is breeding chickens to improve them, those probably wouldn't be candidates for a breeding program. There's also the possibility that there would be a genetic propensity for double yolks in future generations.
That's just a guess on my part.
I understand the OP has purchased these and are a sought after breed. (at least I'd like to raise them if I had the room for another)