They might not like it at first. My ducks are very resistant to new food. I mixed Mazuri with their old food for 3 weeks before they would finally accept it wasn't poison and eat it.
It is more expensive, but I figure the reduction in vet costs is worth it for me. You can also get it cheaper...
I feed Mazuri waterfowl maintenance when not laying, and breeder when laying. My avian vet recommended it. My ducks love it. I also let them forage a little and give them small amounts of veggies and mealworms.
I definitely recommend giving a duck specific feed. I didn't at first, and my...