@PearlTheDuck
feather loss on back of necks is normal since the drake uses the feathers to hold on when mating, It's when it gets down to bare skin we have to separate and give the female some time to recover. Alot of members when a drake seems to like one female above the rest will give their drake time out it's just things we have to do to protect our girls from being over mated.
But you know fretting about it now when your babies are still so young is only going to bring you stress. So relax and enjoy those precious ones. I have 2 drakes with my females and neither abuse their girls thank goodness. So all drakes are not cut from the same cloth so to speak.