Hi
There are others with more experience than me on here but I tried hatching ten Muscovy eggs in autumn last year. We used a
Brinsea Octagon 10 which only has a thermometer so I could only guess the humidity. As such I just followed the instructions (block one ventilation hole during incubation and both during lockdown).
The directions for the
Brinsea state that "Short term variations in humidity are not important. The average over the incubation period needs to be near optimum for the ideal weight loss"
We lost 4 eggs early on to 'no-shows' when candled, and then one pipped almost on time on day 33, she was removed on day 35, and the remaining eggs didnt hatch - I opened up the unhatched ones a few days after and two had broken the membrane but not managed to break the shell - I felt so guilty, so sad.
But we learnt a lot and we have one baby girl duckling who is now about 6 weeks off being fully grown - I've been posting pictures of her from hatching through to her going outside for the first time before xmas, must update as well....
The humidity numbers you quote are what I've seen too, its a trial and errorand know-how from what I can tell... the
Brinsea instructions state that recommended humidity during incubation should be 40-50% RH for poultry, 50% RH for waterfowl, and 70% RH or more for hatching all species (after eggs pip).
Hope this helps
Kevin