i've been avoiding the ostrich eggs..
my husband is ok with the emus.. but I think he would kill me if I ended up hatching up a giant bird with a bad attitude lol
if you can find it a good book for incubation is "Ratite Egg Incubation a practical guide" by D. C. Deeming
just a quick peek into it and I found this info for ya:
hatching process begins around day 39 of incubation
day 40 the chick begins to rub its beak on the inside of the shell membranes to erode them so internal pip can take place.. they mention that they do not have an egg tooth...
can take up to two days to hatch
they tend to shatter the shell during hatch.. and malpositions are quite common since the chick doesn't rotate inside the egg as much as other birds do
average incubation is 42 days.. though there can be a range between 39 and 47 days
incubation temperatures range from 35 ºC to 37.7 ºC (95 to 99.86 ºF). most commonly accepted temps are between 36 ºC and 36.5 ºC (96.8 and 97.7 ºF)
humidity below 35%
15% weight loss.. they do mention that weight loss seems to increase in wild nests as the chick develops and the egg temperature rises.. (ostrich and emu)..
hope this helps!