We're getting into that time of the year when many of us start setting eggs for spring chicks, so this week I would like to like to hear you all's thoughts on incubation. (I'm going to talk about hatching and afterwards next week). Please give me your thoughts and tips on:
- Good incubator recommendations, especially for new hatchers.
- Homemade incubators.
- Selecting eggs for incubating.
- Humidity during incubation - "dry" incubation, what humidity do you incubate at, etc.
- How to handle power outages, temp spikes and other incubation mishaps, like cracked eggs, etc.
Anything you'd like to add.
Got the money? Go with a
brinsea. They're super reliable, stable, and easy to use. Just make sure to calibrate them. Their only downside is the price, which is about $500. Second choice would likely be a Genesis Hovabator. They're styros, but many people swear by them. I don't recommend the LG models---people swear
at them instead of
by them.

If you have lots of time to babysit them, you can get decent hatches, they're just a ton more work. Definitely not set-and-forget.
For homemade incubators, one of the best guides I've found yet is Sally Sunshine's cooler incubator. Link available upon request. It is a simple, easy-to-follow pattern that can easily be modified for different bodies or setups. I'm currently working on my 2nd one.
If you're selecting eggs for incubation, make sure they have strong shells, the birds producing them are well fed, and they aren't deformed or odd looking. Candling them beforehand to remove porous eggs is also recommended.
Humidity is a highly variable subject, with some people running as low as 25% and others as high as 50% to get good hatches. It all depends on area, and interestingly enough, incubator. Cabinet incubators seem to require higher humidity than tabletops. In general, 30-35% is a good place to start, and adjust from there by air cells.
A "dry hatch" does not mean run dry. It's just an unfortunately named idea of running humidity at 25-35% instead of 50%. This has increased hatch rates in styros especially. In some places you won't need to add any water, but for me at least, I need to add a little to keep it at about the 25% that gives me the best rate of weight loss. Humidity levels also depend on the egg colour.
At lockdown, increase humidity to at least 65%, closer to 70%, but not enough to get condensation on windows. Some people have luck with keeping humidity at 30% in lockdown and doing a low humidity hatch, but in general raising humidity on day 18 for chooks gives you the best hatch rates.
Always plan ahead for a power outage if you have eggs going. A generator is my preferred method of back up, but some use their car charger or other ways like water bottles heated on a BBQ.
If you find your eggs at a high temp, immediately remove the lid and let the eggs cool off. Watch temp for several hours later to ensure they return to a stable state.
I cover cracks on eggs in new-skin, let dry, and set like normal. I've had 1 out of 2 cracked chook eggs hatch this way. Other one had a rolling AC and didn't make it long.
Incubation temperatures are best set at 99.5-100.5 for forced air (100.5 is only if you have a reliable incubator that won't spike) and 101.5 for still air. In both of these, temperature should be measured at the TOP of the egg. The reason for this discrepancy is that the still air has "layers" of heat—remember, heat rises—so a higher top temp is needed to get on-time hatches.
If you wish to read more on incubation and delve a bit deeper into it, I recommend reading some of the info in the notes article listed below. Good read for a rainy day or seven.
https://www.backyardchickens.com/a/incubating-w-friends-helpful-notes-links-informational-post-links