My goose family has been producing 3-4 goslings each year for 4yrs now. Last year she left an egg in the nest and this year she left 4 in the nest and only 1 live birth. After almost 2 days of them being left behind, I tried to hatch them and all of them except one was full grown but without an absorbed yolks sac in varying degrees. Can someone explain why this might have happened,?