Humidity for Aylesbury duck eggs

It depends how deep into the incubation process you want to go. To acheive the best hatch rates you'd be best to weigh your eggs every other day through-out the incubation process. Start by weighing a selection of the eggs before they go into the incubator and noting the weights on some paper. Once you have these weights start them of at around 40% humidity. You can the work out that, from the start weight your egg should loose approx 15 - 17% of its start weight over the full 28 day period. So for example, an egg weighing 78g would finnish for best results at 65.5g which is a total of 12.5g. Devide this by 28 which equals 0.44g then x 2 which is 0.88g every two days. this is what you're aiming for. You then go by the method that if you're loosing too much weight too quickly you up the humidity level by approx 5% and vice versa.
Hope this makes sense.
Atb
Tony.
 
I wonder if you weigh the eggs individualy how accurate the scales need to be as the loss will be less than half a gram a day. Assuming there is not too many would it not be better to weigh all the eggs together ?
 
thanks for that , but i really havnt got ther inclination to weigh eggs all the time, my last chicks did 6/7 with a steady 50% , the folk i got them from said 40% will be fine , il go with that .
 
Hi, last year I ran my incy at 60%(what people had told me to) and lost about 14 eggs in the first week to a bacterial infection,I then droped the humidity to 40% and the rest hatched.I upped the humidity in the day or so to 60% again.

Graham
 
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