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It might be courtship behavior -- who knows ducks might find belching sounds attractive. But I only have drakes that do not have females to court. Mine are more interested in squabbling and pecking order behavior than courtship!

It's definitely drake behavior although they don't all do it. I have seen it explained as the duck is adjusting its crop but I am not convinced of that is always the case. Perhaps the first time it is adjusting the crop but then they keep doing it as they get pleasure/relief/some other benefit...