Originally Posted by tlouiselle
I have been keeping the humidity levels between mid 55%-60% (one person told me they hatch at 55% someone else said 60%)...
This is day 9. I checked the levels last night before I went to bed and it was 57%...
When I woke up this morning the humidity had dropped to 37%. I don't know that the heck happened! I added water asap and brought it back up...
Are they most likely dead?
Originally Posted by SunHwaKwon
Your humidity is pretty high. I keep mine around 40. That drop didn't hurt, but keeping the humidity too high might.
xs2 Unless the air cells say different, I would never run that high humidity for the first 17 days. I run 30% humidity days 1-17 and raise it to 70-75% day 18 in preparation for hatch.
Rises and drops in humidity does not kill chicks. Humidity is important over the average of the incubation to allow for proper moisture loss so that the air cells can grow.
High humidity over the first 18 days will not allow the egg to loose enough moisture, the air cell will not grow properly and the chick can grow too big preventing it from being able to turn when it positions for hatch. At hatch time the chick can drown in the excess fluid in the shell.
I never add water to my wells the first 17 days. If I can't maintain at least 25% running dry, I add a wet sponge to hold it right around 30 and I just monior the air cells.
If you are not in a high elevation and are using a table top incubator I highly suggest a low humidity incubation and monitoring the air cells. You can take a look at this, it's the method I use: http://letsraisechickens.weebly.com/blog/throw-away-those-incubator-manuals-understanding-and-controlling-humidity It will help understand humidity and how t o find what humidity works for you. I generally have 85-100% hatches using this method in an LG9200. Many people that hatch at the higher humidity have suffered bad hatches and switched to a lower humidity to have their hatch rates greatly improve. It's a matter of finding what works for your eggs and letting the air cells guide you is the best thing I have found to figuring that out.