Need help - terrible experience incubating

ChibaPet

In the Brooder
Jun 1, 2025
8
35
24
Hi all.

I've kept chickens for years - not well when I was a kid, but with great care and success over the last decade. Our hens are supervised free range girls. We don't have roosters at present as we've not had good experiences, but we want to try them again.

We were going to buy more chicks to expand the flock from eight to fifteen or sixteen, but it's hard to find them this year, so we decided we'd try our hand at incubating eggs. We've raised all our other hens from day-old and we've never lost one while they were growing. We've lost a few to predators over the years and their coop (a converted potting shed) is kind of like an electrified Fort Knox now, and they don't go outside without at least one person out with them, making sure they're safe while they forage in our wooded backyard or while they take sunbaths or dust/dirtbaths. We love our girls and they're more pets than working birds, and they have come to expect lots of attention and treats from us - and to show their gratitude they give us amazing eggs.

We bought "Smart Chicken Incubators for Hatching Eggs with Automatic Turner Small Poultry Duck Quail 12 Egg Incubator Temperature Control Display Hatcher Machine (M12 Pro)" from Wayfair, and it sounded good, and I figured that at $165 I wasn't cheaping out. Once we had it set up, we got a dozen supposedly fertilized Rhode Island Red eggs from a local farm.

There were a couple obvious failures on our part: The incubator said to take out the turning apparatus on day 18, and we took it out on day 17 because we mistakenly thought it was from the day the eggs were laid - we drove them home and put them in a day after they were laid. Also, we were afraid to let them get chilled, so we mostly didn't candle them early, except for maybe once in the first week.

The incubator said it was keeping a steady 100°F thoughout, only barely dipping down when we would open it up to candle an egg. (The candler light was really weak so we ended up using flashlights.) The humidity was mostly 60% up to day 18-19 and then we moved to 70%. They were turning on whatever schedule the thing imposes - it seemed like it was every couple hours, but I didn't time it. We kept them in our bedroom so they'd have a peaceful environment around them.

Several days ago one of the eggs didn't look right and we took it out - it stank. When day 21 hit we were excited, but nothing happened. One of the eggs was pushing out some fluid that would dry through its pores. Reading about that here suggested that it was rotting and expanding out, and that was the case. We candled everyone and saw darkness in half the eggs. Today is day 22, and still nothing. We'd tried warm water in a bowl to see if they moved at all, and no one did. We went through and candled everyone carefully, and we opened all the shells that were passing light easily. They seemed mostly unfertilized, although most of them didn't smell. There may have been a couple fertilized eggs that never started. Then we candled the eggs that were hard to see through. We saw no details that seemed to indicate movement or blood vessels in any. We figured they were dead. One was just a super dark yolk but no developed chicken at all, leaving two prospects. One of the two was rotting and smelled terrible, and there was enough mass there that clearly a little chicken started to develop and failed.

The terribly sad event was the last egg. We could see nothing in it, but we couldn't hear anything and there was no movement. We carefully started opening it, and the membrane was white and solid and not clinging to the baby, so we don't think she (he?) was shrinkwrapped, but she was dead. We took her all the way out as she was clearly not alive, and she was a perfect little thing. Pretty beak, nice eyes, feathers - but dead. I apologize for this as it's sad, but I need to know what happened and I'm attaching a photo we took of her.

We really want advice. We now know we need to candle earlier and often, or at least we're assuming we need to to remove unfertilized eggs. Reading that mother hens will leave the eggs for up to half an hour at a time gave us courage as we figured taking them out for a minute to candle them wouldn't chill them too much. But what happened to this perfect little chicken? Did bacteria spread? There wasn't a terrible smell as none of the eggs had cracked - even the bad ones. Is the incubator we bought simply trash? Did we make some terrible error that impacted the whole batch? We started with a dozen eggs, and while half clearly were *not* fertilized, at least a couple were and started, and one looks like for all the world she should be running around cheeping in the brooder we built.

Thank you in advance for helping us understand this. We want to try again, but I want to go in with more information and ideally know what we did wrong. I'll buy another/better incubator if that was the primary issue. If it was a range of issues I want to know them all.

We've buried the little one in the image near one of our gardens and hope she rests peacefully.
 

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The humidity level in your incubator was too low, it has to be around 60% in order for the chick to break through the membrane. Were the eggs dirty or did you wash them and the incubator was dirty, because there should not be so many rotten eggs?
 
I'm afraid they sold you an overpriced random chinese incubator.
That may well be. I'd welcome suggestions for something better. The link in your original post seems to no longer be valid. I'd love a recommendation for something with an automatic turner, good airflow (this says it has airflow but it wasn't strong if it was there), and a reliable hygrometer. I'm assuming they're sold somewhere, but it's also conceivable there aren't reasonable incubators available for sale.

Are the digital thermometers you're mentioning things that sit inside the incubator? I think I'd need a far larger incubator to get them in near the eggs, and the way the turner worked in this one I think it might be a challenge even with small thermometers. I've gotten a couple USB-connectable thermometers but I'd have no way with this design to get them into the enclosure. I'd welcome advice. But ideally I'd like to find an incubator with these functions self-contained and reliable.

The humidity level in your incubator was too low, it has to be around 60% in order for the chick to break through the membrane.
It was saying 60% up until we locked down, and then we moved to 70%, assuming the hygrometer wasn't completely confused. Are you saying it was too low based on symptoms? The display said we were on the mark, but I don't trust it.

Were the eggs dirty or did you wash them and the incubator was dirty, because there should not be so many rotten eggs?
We didn't wash them but they didn't look soiled. We'll wash the next batch.

I'm sorry this happened to you. Incubating can be tricky.
Thank you. It was all quite sad.
 
That may well be. I'd welcome suggestions for something better. The link in your original post seems to no longer be valid. I'd love a recommendation for something with an automatic turner, good airflow (this says it has airflow but it wasn't strong if it was there), and a reliable hygrometer. I'm assuming they're sold somewhere, but it's also conceivable there aren't reasonable incubators available for sale.

Are the digital thermometers you're mentioning things that sit inside the incubator? I think I'd need a far larger incubator to get them in near the eggs, and the way the turner worked in this one I think it might be a challenge even with small thermometers. I've gotten a couple USB-connectable thermometers but I'd have no way with this design to get them into the enclosure. I'd welcome advice. But ideally I'd like to find an incubator with these functions self-contained and reliable.


It was saying 60% up until we locked down, and then we moved to 70%, assuming the hygrometer wasn't completely confused. Are you saying it was too low based on symptoms? The display said we were on the mark, but I don't trust it.


We didn't wash them but they didn't look soiled. We'll wash the next batch.


Thank you. It was all quite sad.
For a cheap but decently reliable incubator, I recommend Kebonnix. They're 12-egg incubators, tend to keep temp well and the built-in readout is usually accurate on humidity in most cases. I've done many hatches in these, I just buy a ZooMed digital thermometer to attach inside, I use mounting tape to put the temp reading on the inside of the incubator facing out and just use the suction cup to attach the probe to the wall at vaguely egg level. I don't do an additional humidity reader inside, although some people may recommend that. I haven't had much issues. They tend to be 60-90 dollars.

For a more expensive incubator, I recommend Brinsea. For a slight discount, they have scratch-and-dent models on their website that work well and often still have warranties but aren't aesthetically perfect. They're reliable incubators, practically set and forget, and use much less water, but I still recommend a second ZooMed temp reader.

EDIT: Also, don't wash the eggs. Washed eggs have a lower hatch rate because it destroys the natural biofilm/bloom protecting the shell from being permeated by bacteria. A little dirt is fine, but just don't set really dirty eggs and don't wash eggs for hatching.
 

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Helping out – I had this awful little gadget (but hey, it had a 100% success rate). It was the only one that would actually deliver to where I live. Since then, I’ve ended up using it for more than just chickens.

A lot of people seem to have their own spin on the exact same model. I kept a little reptile/hydro/thermo monitor in there too. Just read the instructions carefully and start it early so you can adjust things as needed. Yeah, the alarm is annoying—but chicks hatching? Totally worth it! (Game birds, chickens, parrots—you name it!)

Screenshot 2025-06-01 at 4.08.34 PM.png


Also note: I never wash the eggs.Washing eggs can remove the natural protective coating, which acts as a barrier against bacteria and moisture loss.
 
I'm really sorry that happened to you.

The first thing I'd do is get a thermometer that you can trust and calibrate that incubator. I use a medical thermometer. It is not unusual for the pre-sets on incubators to be wrong, even the more expensive ones. Many thermometers are not set correctly either. You need to use one you trust to check that incubator. The turner does not need to be on or even in there to check the incubator preset temperature. A lot of incubators are reliable once you get the temperature set correctly. It's the thermometers that come with them that are often unreliable until they are calibrated.

The same is true for hygrometers but I don't worry about that as much. There is a wide range in humidity that works where temperatures need to be close. Still, 60% seems very high for incubation and a bit low for hatch.

About the last thing a hen does when she lays an egg is to put a coating of liquid in it. We call that bloom. The liquid quickly dries and forms a coating that is very effective at keeping bacteria out. If that coating gets corrupted bacteria can get in and cause the type of problem you had with those stinky eggs. A light coat of dry dust is not a problem but a glob of poop or mud on the egg means that bloom has been corrupted.

You said the eggs were not that dirty. With that many rotten eggs I suspect someone washed the eggs before you got them and removed the bloom. I think that is what @Altairsky was talking about. Do not wash any future eggs. Only set relatively clean ones.

For them to turn rotten like that bacteria had to be present. Be careful when handling eggs, make sure your hands are clean and you do not put them somewhere "dirty". Sterilize your incubator before you start the incubation. I wash it with a mild bleach solution.

Increasing the humidity a day early should not have caused a big problem. There is a pretty wide window that works. Many people make a mistake in when to increase the humidity because of a mistake in counting. If that hygrometer was reading correctly that humidity was higher than I would use for incubation. I'd look more in the 45% to 50% range. For hatching 70% should work.

I'm not familiar with that incubator. I don't know if it was a problem or not. I do not have any suggestions for that.

Again, I'm really sorry for your experience. That was rough.
 
For a more expensive incubator, I recommend Brinsea. For a slight discount, they have scratch-and-dent models on their website that work well and often still have warranties but aren't aesthetically perfect.
Thanks for the recommendation. I've seen that listed other places too. I've put in an order for a scratch-n-dent 24-egg (12 for Rhode Island Reds) fully-automatic job. I'll still need to find a thermometer I can trust to put in, as per several folks in the thread. (Thank you all!) We also snagged their fully-enclosed candler.

Also, don't wash the eggs. Washed eggs have a lower hatch rate because it destroys the natural biofilm/bloom protecting the shell from being permeated by bacteria.
Washing eggs can remove the natural protective coating, which acts as a barrier against bacteria and moisture loss.
You said the eggs were not that dirty. With that many rotten eggs I suspect someone washed the eggs before you got them and removed the bloom.
Thank you all for these recommendations. My wife wants to not go back to this place given the number of unfertilized eggs, but I think if we can avoid shipping the eggs that'd be better. We will *not* wash them, and we'll make sure the farm doesn't either before we get another batch. We were aware of the bloom and we don't wash the eggs we keep to eat for this purpose, and I'm not surprised the same applies to fertilized eggs intended for incubation.

I'd look more in the 45% to 50% range. For hatching 70% should work.
This is worth knowing and we'll adhere to this - we'll do 47.5% and have it go to 70% for hatching. It looks like the Brinsea will let us set our desired values for the whole program.

I'm still bummed out thinking about that perfect little chicken that didn't hatch, but we'll try it again with the better kit. I'll also look for more guides on candling frequency, but I'd love to know if there's a candling schedule people particularly like here. Also, I've read that you want to candle sharp-end-down but we struggled to see anything that way, so I guess some tactical advice would be very much welcome.

If all goes well we're going to incubate more chickens over time. I have this fuzzy dream of having hybrid Rhode Island Reds / Leghorns since I love both breeds. We'll need a bigger coop at some point because we want our girls to have enough room to be comfortable even when they're not roaming the back yard.
 
I'll also look for more guides on candling frequency, but I'd love to know if there's a candling schedule people particularly like here.
Candling does not help them hatch. Unless you drop an egg and crack it or handle it with dirty hands candling does not hurt the hatch. One reason I candle is curiosity. I want to know how it is going. Another reason to candle is to remove any eggs that are to going to make it. Some people candle to keep track of moisture loss.

I candle at 7 days, purely for curiosity. I do not remove any eggs at this time. I candle when I lockdown and remove any that I'm sure will not make it. That is not because I am worried about an egg going bad and exploding or leaking, I sniff them to test that. That is just so I have more room in the incubator during hatch so it is easier to keep track of individual eggs after they pip.

Some people candle every day. Some never candle. As long as you don't get ridiculous about it you will not harm them. But it does not help the hatch.
 

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