Gail Jardin wrote: I hope to replace my other breeds and have only Silver Apple Yards from this fall forward.
Are you planning to actively try to protect the breed?
I live on an Island, and as much as I love Khaki Campbell ducks, people here allowed them to in-breed and I have found hatch-ability is poor. So I understand your concern with people introducing other breeds into the mix, but I've had to do that myself with a bit of Golden 300. I've tried several times to get "fresh blood" from off Island, but so far have been unsuccessful, so I had to compromise.
I've had some concerns about "show birds" being all for show, whereas, I admit, I'm looking for farm animals. I want good laying, good hatch-ability, and good health, not just birds that look like what the book says they should look like. I've been trying to have my Muscovy hatch and raise them in the hopes that they will be better with watching for predators. I can't say that I've been successful. As Kristine Ellis' book says, they are a prey animal, and if affects what we can expect of them.