When incubating mallard duck eggs what way should the be laying?

The correct way to incubate mallard duck eggs is to place them with the larger end up. This is because the air cell is located at the larger end of the egg, and it needs to be at the top of the egg for proper development. If the egg is incubated with the smaller end up, the air cell will be at the bottom and the embryo will not be able to get the oxygen it needs to develop properly.