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PUT THE VENT PLUGS IN FOR THE FIRST 10 DAYS ONLY and then REMOVE ALL VENT PLUGS for the rest of the hatch! NOTE: When Lockdown occurs, vent openings are frequently restricted in an attempt to boost incubator humidity. Instead of helping the chick hatch, the chick is suffocated from lack of oxygen. Never decrease ventilation openings at hatching in an attempt to increase humidity. Increase humidity by other methods. If any vent adjustments are made, they should be opened more. Try adding a dampened sponge or towel to help boost humidity during lockdown.
VENTILATION (OXYGEN)
Hatching at High Altitudes post #37908
O2 deprivation to day 10 of incubation followed by regular oxygen concentrations leads to stronger chicks post #33815
PUT THE RED VENT PLUGS IN FOR THE FIRST 10 DAYS ONLY and then REMOVE ALL VENT PLUGS for the rest of the hatch!
NEVER USE VENT holes as a means to Control HUMIDITY especially during HATCH DAYS!