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That easily explained ... the chicks call to each other from within the egg to encourage a sycnronized hatch .. (Survival tactic - strength in numbers thing) So basically your 'buttons' have encouraged the coturnix out early.
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Ok, what I was getting at here is a female bobwhite doesn't come to POL until around 20-24 weeks of age, Coturnix @ 6- 8weeks .... so bumble must of been around 10-12 weeks old when she laid her first egg, so she matured twice as fast as a BW, but her egg that are just quarter BW took BW incubation time
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like I said before coturnix eggs can be dramatically different, have a look at my forum, or use the link to my old forum, there's dozens of pictures of the strange colours they produce from pure white to dark brown, blue green to speckles that resemble pictures and those are just pictures from my own birds .... again my point was the size, colour & shape of a BW is very distinctive .... I would have just expected there to be something different about them.
I must admit I know very little of the genetics of egg colour, never been important, but part of my hobby is breeding colour mutation coturnix & bobwhite .... It never ceases to amaze me the weird and wonderful colours that are thrown until a colour breeds true. For the first 2 generations you can usually tell which colours have been bred together no matter if the colour was dominant, incompletely dominant, or recessive .... but I'm totally baffled that for some reason the BW gene seems to completely recessive ...
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Not just hard but impossible - try and get hold of this book 'Handbook of Avian Hybrids of the World' By Eugene M. McCarthy ... according to the 2008 edition there has never been a documented coturnix sp x Colinus hybrid .... so if your little bird could be DNA tested and proven to be what is claimed, she'd be a priceless scientific discovery.
Anyway, thanks again for the information, I'll try not to ask any more questions until you post your photos.
Suz