I had a duckling just 3 weeks old I had to have put down for neurological symptoms (seizures, fell over upside down and could right itself, couldn't stand, etc). I took her, Flip, to the vet and they said she had no pupillary response and we had her put down. We took her to University of Kentucky extension office for a necropsy. My intent is to breed and sell them so I need to know if it was infectious, something I was doing wrong or genetic. That came back inconclusive with metabolic disorder as #1 possibility. I now have one of my full grown call ducks showing similar symptoms. Is there something that is particular to call ducks that would cause this?