I dont think you should let them free, because since you raised them since birth theyre not going to know how to survive at all, and most likely will end up dying. If you sell them, just make sure they are with someone safe (not gonna abuse or eat them)

Better sell them since they are used to you feeding them and careing for them If leave in the wild they will die or reture to you daily looking for the feeds you have been suppling so far and the dog will get to them Sell them or give them to another farm that wants to care for them.

I raised 5 Mallard ducks since they hatched. One died and the other disappeared. Anyway, I now have 3 females and we live right on the lake. Lots of ducks and such live out here. I wanted to keep them but my dad's dog will most likely eat them. They always swim in our pool and are almost ready to fly. I wanted to sell them to another family but my dad says we should release them into the lake. My only fear is that they might die, being as they were raised in captivity. So what should I do?