Hmmmm, I think I read about this on a goose list last year. Some geese will lay in the fall, but if allowed to set or if the eggs are incubated, the goslings are often not very healthy. Now, this is just what I read, not from first hand experience. Someone had tried to hatch some out, two died, and one lived but was very fragile, had a hard time walking, weak, etc. Others were saying this happened with fall hatches due to the depletion of calcium and/or vitamins (can't remember exactly) in the parents from breeding season.