Originally Posted by kuchchicks
I think your humidity is too low at 40%. I would raise it up to near 70%. That's probably why they are sticky. With your humidity that low I would not open your Bator a whole lot.
Originally Posted by PoultryQueen101
I'm not going to raise it past 50% if anything too many chicks have drowned. 70% wet bulb... maybe.
I hear chirps in the down bator and have 1 pip and since it's the brinsea mini, I can see a couple chicks breathing in the air cell.
As for the other... nothing.
It should be nearing the end of day 21 for silkies. And day 21 for minorcas and buckeyes.
Wet bulb are not percentages, they are in degrees and if you are using a wet bulb you need a whole different set of numbers than a hygrometer. If you are using a hygrometer, 50% is very low for a hatching humidity. Chicks don't "drown" from high hatch humidity, they drown from an average high hatch humidity that does not allow the egg to loose enough moisture over the period of the incubation as a whole. Eggs don't gain fluid from extra humidity. Extra humidity prevents the egg from loosing the fluid in itself. As long as you have gone into lockdown with healthy sized air cells and the egg has lost the moisture/weight it needs to raising the humidity for hatch does not cause "drowning".
I personally shoot for 75% during hatch and often it ends up 80%+ because I am a meddler and open my bator often during hatch. People that have a hands off method can run at 65% very successfully, but I would not ever be comfortable running hatch under 65%.
Humidity is carefully controlled to prevent unnecessary loss of egg moisture. The relative humidity in the incubator between setting and 3 days prior to hatching should remain at 58-60 percent or 84-86º F., wet-bulb. When hatching, the humidity is increased to 65 percent relative humidity or more.
Frequently there is confusion as to how the measurement of humidity is expressed. Most persons in the incubator industry refer to the level of humidity in terms of degrees F., (wet-bulb) rather than percent relative humidity. The two terms are interconvertible and actual humidity depends upon the temperature (F.) as measured with a dry-bulb thermometer. Conversion between the two humidity measurements can be made using a psychrometric table. Taken from: http://msucares.com/poultry/reproductions/poultry_environment.html
I disagree with the first 18 days being that high as I have found that a low humidity incubation, especially in the styro bators work much better, so I shoot for 30% the first 17 days to allow for moisture loss and I monitor my air cells then I go up to 75% for hatch. I rarely loose any chicks post hatch and have no deaths after pip or leg issues. Hates rates from lockdown 90%+ my highest was 100%
But you also have to take altitude into consideration as well, because hatching in a high elevation poses it's own problems as well.