Are these fertile

[Nicky1]

I have a drake and 3 female ducks , I have tried incubating eggs from them last year and none developed , I have 8 in the incubator currently and on day 7 with no signs of development , on checking eggs I can see they are fertile but nothing happening in the incubator. The incubator is working fine , incubated other eggs with it , just not my own duck eggs !@! Any ideas

 

[Nicky1]

I attach pic of eggs

 

[mcdze]

those look good to me, make sure temps right in the incubator .. use a digital thermometer and put it right by the eggs standing up. not laying on the bottom or off to the side ...

 

[Nicky1]

Thanks , I will double check temperature , but would there be any reason why they are not developing in the incubator ?