Some do.
My runners laid for 14 months, then a month rest, then 12 months, then a few weeks' rest, then 9 months, now 3 months' rest and counting.
As we can see, they don't quite have a real rhythm. There are so many variables, too. I am happy for them to take a rest.
Some ducks lay year 'round - generally speaking. And a number of breeds are seasonal layers, like Muscovies and Black East Indies (from what I read).
My runners laid for 14 months, then a month rest, then 12 months, then a few weeks' rest, then 9 months, now 3 months' rest and counting.
As we can see, they don't quite have a real rhythm. There are so many variables, too. I am happy for them to take a rest.
Some ducks lay year 'round - generally speaking. And a number of breeds are seasonal layers, like Muscovies and Black East Indies (from what I read).