Due to an egg mishap by my husband not marking eggs I am not sure is these dark goslings are dewlaps or Sebbies. I have grey dewlap talouse in one pen and two white Sebbie girls covered by a white boy and a blue boy (the blue is the dominate one). I didn't think my dewlaps were fertile because they are only a year and the 10 eggs I set that I knew were dewlaps never developed. Thoughts?