I think the drakes will make a difference they just want to mate and have no one to throw themselves at but your gander. I think it depends on which comes through on the mix breeds Cayuga are smaller than Muscovy so you may be seeing more of the Cayuga than the scovy but my female scovy's are anywhere from 4-6 lbs my drake is 10lbs. My Buff Orpington ducks are actually larger than my female scovy's in size. I haven't weighed them so not sure on weight.
