Here's a thread of mine from two double yolkers I tried. The large green one I started the thread with was not fertile and was most likely a duck egg. However I also put a large brown one in bator at same time. It made it all the way to hatch day and then did not pip. I finally broke a small hole in air cell end so that I could see and I could see it breathing. I watched it most of day but it finally stopped. Then I got worried about it's twin and broke the egg open in an attempt to save it. It was still living as I was trying to gently pick shell away but died before I could get the shell off and membrane open.
There are some pictures if you want to see what they looked like - they are on Page 4.
https://www.backyardchickens.com/forum/viewtopic.php?id=87299
I now have another double yolker in bator on day three. I can tell that at least one yolk is developing but it's hard for me to see into the brown eggs until they are farther along.
Good luck with your twins. I'm convinced it can be done and that you just have to help them out at the right moment because I could see both of mine breathing and moving and waited too late to open it up.
There are some pictures if you want to see what they looked like - they are on Page 4.
https://www.backyardchickens.com/forum/viewtopic.php?id=87299
I now have another double yolker in bator on day three. I can tell that at least one yolk is developing but it's hard for me to see into the brown eggs until they are farther along.
Good luck with your twins. I'm convinced it can be done and that you just have to help them out at the right moment because I could see both of mine breathing and moving and waited too late to open it up.
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