Coturnix Tibetan Quail S.O.S.
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There's a lot of good info here:
From what I know of it as a guy new to quail incubation, heat should be 99.5 the whole time. Depending on what method you use, humidity can vary, but general guidelines are 40% until lockdown (typically day 15 or 16) and then raise to 60%+ until hatch day (typically day 18).
What kind of incubator are you using? Does it have a fan? Did you use a hygrometer? Did you calibrate your thermometer?
I'm new to hatching quail, and I'm not sure. Baby chickens you can hear loud and clear, but I just don't know if quail chicks make noise or not. I'd say if one is hatching, you'll know if the others will or won't in the next 48 hours. Don't open the incubator too much, you want to keep that humidity high for the end of the hatch. Good luck!
Yes and no. At a young age they will all be so small that I don't think you have to worry about it getting picked on, but keep an eye on it as it will be the smallest! I've ready about some diseases that chickens carry immunity to being harmful to quail, so some people don't keep them together. I have kept my quail in a pen near the chickens and haven't had any issues yet, but it's something to consider. Finally, as they age, quail have excellent flying ability and will have to be in an enclosed area or they will fly away.