At least 6, possibly 7, and more pips.
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FYI, for anyone who is wondering, prior to setting them I sprayed all my eggs off with hydrogen peroxide (H2O2) until they were dripping, and used a microfiber cloth to scrub off any dirt while they were wet, and rinsed with H2O2 as needed. Then I let them air dry on plate on a paper towel (until they were mostly dry) and then put them into the heated up and ready to use incubator. They finished drying there. All 24 of my eggs developed fine. A few stopped developing as I listed in the post above. I've seen no issues with bacteria, mites, etc. Not even any pasty butt, and we're around 2 weeks post-hatch now, brooding in my garage with heat lamps.So the final count - 20 babies out of 24 set eggs!!!
All 24 set eggs were fertile. (Kudos to my rooster!) One stopped developing after Day 13 or 16, two didn't finish growing after they visibly looked like a chicken, and one had to be culled after a successful (unassisted) hatch due to having a lot of viscera that did not go into its body through the umbilical area when they should have, and I couldn't fix it .
In addition, it was a staggered hatch (newbie mistake!), with one due a day after the main hatch (Egg 22), one due three days after (Egg 23), and one due 8 days after the main hatch (Egg 24).
I couldn't afford to buy another incubator for three eggs, and wanted to give them the best chance of success, so I threw together an incubator from what I had around the house, and created a still air incubator using a pressure canner and my old reptile supplies. Egg 22 stayed one day in the still air incubator, Egg 23 stayed 3 days, and Egg 24 stayed 8 days in the pressure canner still air incubator before I moved them each individually to the Nurture Right 360 for lockdown and hatching. Eggs 23 and 24 hatched on time without incident! (Not sure why Egg 22 died, but upon eggtopsy it wasn't full grown)
I thought it was pretty cool that I was able to successfully create an incubator last-minute and successfully incubate eggs using a pressure canner and my old reptile supplies, especially never having done it before, and in a unique setup, so I wrote an article about it. Check it out!
https://www.backyardchickens.com/ar...ubator-for-rescue-of-a-staggered-hatch.78314/