I've got 19 Rouen duck eggs in the incubator right now, at day 9. I just candled them to find ZERO fertile. The last time I incubated some (October or so) there was maybe 1 egg that had signs of an early death. The Rouen ducks are 9 months old. Is it just the cold weather now?? Do they stop mating in winter? I haven't witnessed them mating in a while, but then again, like my husband's friend said when he told him that he never saw them mate..."Maybe they've got some dignity.. Exactly how many people have seen you s**** your old lady??"