You have man ducks, we call them also drakes. There need to be three, six, or more girl ducks for each drake. She could be getting hurt, could even get killed by too many drakes mating her. She does not need drakes to lay eggs.
Muscovies are seasonal layers, they do not lay all year. Get...
Well, I can offer some guesses.
We have some different terms and types of feed where I live. Are corn layers pellets all corn, or half corn and half other materials? The treats sound good.
Seems to me based on reading and experience with my flock, that individual ducks have slightly...
Sounds like a Pekin.
Does he or she quack loudly, or have a quiet voice?
Ducks don't always take to a nest, so don't worry about that part. What are you feeding the duck? Are you in the northern hemisphere (where it is now winter) or southern hemisphere (summer)?