mine were hatched with the problem.. as far as i know it is when they hatch. Temp problem or vitamin deficiency.
My problem I think is the I am incubating large and small eggs. I am getting good hatch rates with large eggs but having poor results with the bantam eggs.
Last hatch had 2 with...
your not cooking them with exhaust fumes but heat from the manifold. I said seal the foil. I worked on the river years ago on a boat and had no galley and I used to reheat my food for dinner sometimes on the exhaust manifold of the diesel engine. . The exhaust manifolds on those engines are...