I have a lovely Khaki Campbell drake. He is a healthy 2-year-old and is proven (very, very) fertile. He has been great with only one duck (we did have a bunch of chickens too) and has not abused her. He is quite predator savvy and is very watchful and concerned for his girlfriend. I have switched breeds to focus on Welsh Harlequins, and this guy's genes aren't terribly welcome anymore.
He is way too nice to eat, and deserves to make babies for someone else now!