Been a long time since I ever listened to anyone discussing the problems they were having with their birds.
My understanding is that it isn’t a good idea to allow ducks and chickens to mix. I recall something about them trading parasites. Lice maybe?
If ducks and chickens are “hanging out” together, is it considered miscegenation or bestiality?
You are correct. Mixing turkeys and chickens is an even worse idea because chickens can pass blackhead to the turkeys.
A chicken is an amazingly resilient creature, it probably has something to do with them being domesticated for so long. Turkeys, on the other hand, have had the wildness and brains bred out of them and the brests bred into them for only the last century or so.
Due to the practices described here (plus their propensity to employ illegal aliens with TB), I will not buy chickens from Tyson, Purdue or any other mass production outfit. Several Amish farms in our area sell chicken commercially under sanitary, free range conditions. You can really taste the difference.