![]() Depth of water does not matter for humidity, other than to maintain it. ![]() The more water surface area there is inside the incubator, the higher the humidity will be. There are two controllable factors to consider when altering the humidity during incubation. Then every few days when you weigh the eggs, mark their weight along the graph and note where it falls on the blue line. You can plot out the ideal weight loss from day 0 through to hatching, which we show here in dark blue. The incubation days will be our x-axis going across, and the weight will be the y-axis going up. If you’re good at math it may be fairly simple for you, but for those of you that aren’t it may be helpful to draw a graph (see below) to keep track. By weighing the eggs every few days you can accurately adjust the humidity to compensate for too much or too little weight loss. ![]() Most bird species (with the exception of the ostrich family) will need to lose between 13 and 15% of their weight from the first day of incubation to the day they hatch. So, in theory, you could simply weigh the eggs periodically to check on their progress? If you’re hatching in an incubator without a reliable hygrometer then that is exactly what we recommend doing. So what happens if you don’t have a hygrometer, or you aren’t sure if your hygrometer is accurate? As we mentioned above, humidity that is too high or too low will affect the weight loss of the egg during incubation.
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