I had infertile eggs from my call duck pair for about a month due to some or other reason. They recently started to produce fertile eggs and 100% hatch rate was achieved with the following settings in a Grumbach incubator:
Temperature 37.5 degrees Celsius
Relative humidity: 55%
Eggs were not...
Morning. Calsium (Cals-UP) a calsium powder available in SA. make the food damp (not wet) and sprinkle the powder onto the food.
You can repeat this once a day for about a month. You should also keep feeding grit to esure that the calsium levels will be maintained in their bodies.
Regards...
Add calsium to the food as it normally is calsium shorthage causing shoft shell eggs. The grit will also assist but takes longer to address the problem.
As for the eating of eggs, this is a habit you will struggle to get rid of. Dummy eggs migt do the trick.
Regards
Corrie