My birds all free range together, so "pure" is not possible with my set up. Well, it's possible if I only have ONE breed of ducks....which is what I decided to do. However I DID tell my SO (Ray) that I bought them. He wasn't amused. He is out of town right now. I have told him and told him "Don't leave me home alone unless you don't care what I bring home". LOL I backed off and told him the brooder was to heavy for me to move myself, so I didn't buy them. (If he had been home, I probably would have. LOL)
Someone asked about mixing silkies with other breeds. I did it, successfully....Silkies have a MEAN attitude when messed with. (Short man syndrome, I think it's called. LOL) All my silkies got eatten by something...one at a time....probably because they were white and therefore easily spotted from the sky. I won't get more....egg size being the reason...they were all good layers...5 - 6 a week....but just smaller than I wanted to deal with.