Mine are fertile they develop and then quit. Most by day 14.I got a 100% hatch from my last incubator session. That is 100% of the fertile eggs hatched but I only had 3 fertile turkey eggs out of the 27 eggs that were put in the incubator. A certain tom was not doing his job.
The turkey eggs are doing great. The chicken eggs not so much. I through collecting turkey eggs. I have more than I need in the incubator. I am thinking if they all sell, I will fill the freezer with young turkeys this fall. The two of us can eat quite well on 30-40 10-12 pound turkeys this winter.