they are hard to hatch and one little thing can cause them to die, ie dirty incubator, temp to hi to low. not turning properly, egg shells are sometime to thick/thin.
ok you asked on temp/days
19 days is about right +- 12 hours
99.5 -100 degrees works for me.
and i do around 60% humd.
but things may vary slighty depending on your hatcher, a chicken always works great..and most of the time hatches as good or better than any incubator...
i am using a 1502 ghf incubator, they do everything , put them in and forget until 17th day..
frank
fat cat farms