not sure how well they will bond on another breed, thought on it is if ya can get same breed to make it easier as should have all same behaviors, or you can put your silkie in with the baby duck and see how they do, it doesn't matter as much with size, that duck we brooded with the new baby chicks as probably 2 weeks a head and a large breed duck to boot, it played momma to the baby chicksAwww what an awesome thing. We thought of trying my cross beak silkie chick but she is to large and I was wondering about that mixing breeds issues lol. Might have to go feed store tomorrow!! Can I get a different breed?