none of my birds pluck their self
but i've had 2 different pair of lovebirds, that the female plucks the male when they go to nest - it doesn't matter if you switch males or not. They do it every time with every male.
they've never plucked their self OR the babies. They're GREAT mom birds
Why they pluck their mates? I have not yet figured it out , its not aggression, or hatred or anything they just do it and the one is VERY FAST about it, The male will be fine when i go into shut the light out, the next morning half his wing is plucked bald, and he lets her do it, He doesn't "cry out" (I would hear that since once the light is out the birds room is silent, and they're right next to my bedroom) nor does he try to get away.
Once all their eggs are laid though I remove him (even though he hates it and it stresses him out even being in a cage RIGHT BESIDE HER he wants with her!) it used to be She didn't start doing it until the babies hatched (thats how I knew they were starting to hatch) but now she does it right off the bat
oh and their babies do not pluck either.
This pair did it with the previous owner as well, and I can guarantee you they are living a better life here and being fed a whole lot better here than they were there, So I doubt it's the environment or what they're being fed
but in general you shouldn't breed birds who pluck, most will pluck their babies then the babies learn this and pluck their self or other birds and if they're bred their babies
but since this has never happened with my 2 lovebird pairs who do it (well one now, because I no longer have the other female who was plucking her mate) I still breed them NOW if the tables were turned and they plucked the babies then no I wouldn't breed them any more
But I do think There is a huge difference between breeding a bird who plucks in general (that most likely would be a "health issue" , and breeding a bird who only plucks while breeding - rather its their self or their mate. I don't consider all of these types "health issues"
I had it happen with a pair of budgies, their 1st ever clutch went smooth. Second clutch I checked the babies before turning out the lights all were fine , checked the following morning to find one covered in blood and missing a lot of feathers - and since it was only the mom in the cage (I'd removed the dad several days before, so they wouldn't try to have a 3rd clutch) I knew it was her, I removed the babies Hand fed them and she was sold as a PET ONLY I didn't want to take the chance of it becoming an on going thing (like egg eaters) So she was stricktly sold as a Pet only and the people who bought her was WARNED about why she is now a pet only. and they had no intentions on breeding they wanted a pet only So that worked out great.
But we breed for mutation and temperament(along with bigger healthier birds than you would ever get a pet shop) . most of the time my pairs pick their own mate. but there are times We pick the mates for them. BUT since all my birds are laid back, Mellow and generally nice Those traits get passed on, even if I'm breeding for mutations