I think it's 13%
I found it in the hatching 101....Who has the link for how much weight an egg should lose before lockdown? Is it 15%?
Humidity is NOT A SET NUMBER, you need it YES!
However, you use it as a tool to "adjust" egg weight loss during incubation. We candle on days 7,10,14,18 To WATCH WEIGHT LOSS IN EVERY EGG! An EGG MUST lose approximately 13-14% of its weight during the incubation process. THIS IS YOUR GOAL!! You can monitor this by marking Air cells and also by weighing. Please refer to CANDLING section of this Article for more Air Cell info.
However, you use it as a tool to "adjust" egg weight loss during incubation. We candle on days 7,10,14,18 To WATCH WEIGHT LOSS IN EVERY EGG! An EGG MUST lose approximately 13-14% of its weight during the incubation process. THIS IS YOUR GOAL!! You can monitor this by marking Air cells and also by weighing. Please refer to CANDLING section of this Article for more Air Cell info.