This can be a complex subject, as i have said before i suggest you use no water at all throughout incubation, once all the chicks have pipped through the outer shell you can then add some luke warm water to the water trays of your incubator, once you have done this do not remove the lid or open the incubator door until 6-12 hours after the hatch
During incubation eggs should loose 12-16% of their weight, with quail eggs this is difficult to measure as the eggs are so small, if you are incubating many eggs it is easier as you can take an overall weight of many eggs
Weight loss is due to humidity levels, if you keep water within the incubator you are unlikely to acheive adequate weight loss
Inadequate weight loss at hatch day will result in oversize developed chicks, when the chick pips into the air space there is not enough air within for the chick to breath before it pips the shell, also the chick is so large it has no room to move, to breath or to chip round the shell
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