It's exactly like dog breeds a male Chihuahua could impregnate a Great Dane female. If you breed a green egg breed with a brown egg breed you end up with Olive Eggers.
It may be difficult for a Serama to breed with a large hen but technically it can happen. Rumpless Auracana have difficulty breeding as far as I know they are the only one's and it's just due to being Rumpless.
I ordered 25 chicks and got 27 last April and they are all still health and laying well I'm very happy with my birds. I will say they are a bit small but other than that they are good birds,with the exception of the Black Sex-Links I don't really care for their looks or egg quality but, the Red...
I'm planning on starting a Welbar project at the end of this year (2012) or the beginning of next year.I'm starting a Gold and Silver Legbar project in the next month or so.
I'm going to do this in probably three parts it's very in-depth and I don't have time to show it all at once I hope everyone understands. It will seem complicated but that is just because I'm going step-by-step.
Parts List:
1. 8 bottle wine cooler.(any size will work).
2. Bi-Metal thermostat...
I think it depends on what materials you used, the size of the interior,how well it's insulated etc.etc. All factor in when it comes to holding a steady temp.