Is that a problem? The Muscovy duck that just hatched out 15 ducklings mated with a drake from the same mother. May, or may not have had the same father. Now when these babies come into adulthood and reproduce... maybe with their bio. brothers, and so on, will it be a problem? How many generations can breed before serious problems. This is all new to me. Should I then give away all of my drakes and buy drakes from a complete new source? I hope someone here can help answer my questions. Thanks..