Hi - its sounding fine and they do sound fertile as the red dot (the heart of the developing embryo) is the first indication of fertility. Within another day or two the supporting blood vessels become easier to see. 2-3% weight loss is fine as its often slightly lower in the first week but the rate increases as the embryo grows.
All sounding good and I wouldnt change anything, just keep an eye on that temperature as goose eggs do better at slightly lower temperatures than other poultry
All sounding good and I wouldnt change anything, just keep an eye on that temperature as goose eggs do better at slightly lower temperatures than other poultry