I have large hens that tend to break their eggs. Also when it's humid I have had zero hatch under the hens. So I usually give a few fresh eggs to a broody and put some in the incubator so they all hatch at the same time. I give the broody the incubated chicks.higher percentage of successful hatches with using incubators? T
Last couple years I haven't interfered due to long covid. Out of 18 chicken broodies 3 hatched one or two chicks.
A turkey hatched 4 and she killed one along with a couple poults. (She was sold with full disclosure. I think she was the one that did the same the year before) I gave the remaining babies to "good mama " turkey hen who had a mink get the pullet at about 8 weeks.
I have had pullet hens show up with chicks though.
All the turkeys hatch their eggs. They aren't always the best moms though