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Update: Ok, I never found the info, so I just had to wing it. I wound up putting the chicken eggs in 4 days after the guinea eggs. After a few days I decided I shoud have waited one more day and worried the whole next 2 1/2 weeks. I candled them at (I think) guinea day 20/chicken 16, and all but 2 looked like they were coming along fine, I could see moving parts in most of the rest, and a few didn't see movement, but there had clearly been a lot of development. So I threw away the 2. The first chick hatched on chicken 20/guinea 24. Then 2 more chicks and a keet the next day, and then a keet each day! So out of 12 chicken eggs and 4 guinea, I have 3 chicks and 4 keets! And momma didn't even set much the last couple days (but it's been over 100 here and she slept on them at night). So my conclusion based on this small sample is that guineas are way tougher than chicks. And I probably could have waited another day to set the chicken eggs, but it didn't seem to harm anything since all the guineas hatched anyway.
I eggtopsied the remaining eggs. One was totally undeveloped, one had formed a little marble-sized embryo, but of the other 5, 4 looked fully formed but still had an enormous yolk remaining, and the last one had even absorbed its yolk and looked just like a perfectly just-hatched chickie. And it was a cute little black copper Naked Neck, whose mom is our favorite hen.
So since we had such a low hatch and have lost a couple older hens recently, we ordered some chicks, which will arrive tomorrow. I'm hoping she will accept them but am prepared in case she doesn't. I think she will, she's a pretty good broody (especially for a non-broody breed!) This is the one time I'm happy it's so darn hot here, only need supplemental heat at night...
Oh goodie I am so glad you winged it ..... Pardon the pun
I had been worrying about you since you first posted in the guinea area...
congratulations on success
Pix please