If your right then my gander at almost 7 years should be nice and fertile. None of my gooses eggs this year were fertile she was a year old this past April. she laid 60 eggs,. I didn't look at them all but did candle quite a few after 2 weeks of sitting by one of my Muscovy's and my goose and none were fertile. and this was at beginning of her laying and at end of it.
wow your yearling layed alot of eggs for a yearling and the eggs will be more fertile when 2 years of egg