Just saw this thread, sorry I wasn't on here sooner. I'm the person she got the eggs from and No the birds are not interbred. I keep two separate drakes for genetic diversity and several hens. I'm looking into the Niacin deficiency thing, but I've never hatched any that came out deformed from my flock and I've hatched many ducklings from them..................................... I do not know if temperature was off or not it was just a suggestion that I pointed to as a possible cause for malformation since I'm not hatching any deformed ducklings here at the farm.
If I was hatching out deformed ducklings I would certainly not be selling hatching eggs from my ducks. I'm not entirely sure what went wrong with this hatch, but I can assure you this is not the hatching results we are having here on the farm.