I have two ducks and a drake born last July. The ducks began laying in February and haven't missed a day since. They stopped going back to the protected shed at night once the pond filled and have been nesting around the pond area. Two of their nests were raided and each time they moved the nest so I typically leave the newest eggs and pick up the previous days so they'll keep using the same nest that is in a good location. Last week they began to act broody so I left the eggs to see if they would sit full time. Each day they would sit for longer and longer periods and share the stint, taking turns sitting while the other went for a swim and a bite. In the last few days, they began leaving lots of feathers and down on the nest and have only left it at night when all three are seen together in the pond. The problem is, they are still laying and adding eggs to the nest each day and It now has 20 to 22 eggs.
Will these ducks ever go into full broody? If the do, should I fear, only the fist eggs will hatch before the rest are abandoned? Should I remove the most recent eggs once production stops or should I remove them all at some point?
Any and all advise appreciated.