I've got two energetic happy runner ducks they're super entertaining! Last night I went out to put them away with my geese and I noticed they were both sitting down, I didn't think much of it but when I went to let them out this morning, they were both limping! (more like lifting one leg higher than the other.) they also looked low on energy, sitting down and not moving as fast. I'm thinking niacin. I normally feed my geese and ducks Nutrena all-flock with no added niacin and have had no problem. my ducks have lately been sneaking into my chicken coop and filling up off of the chicken food which doesn't have as much niacin as the Nutrena all flock. I'm thinking that that's what caused the deficiency? I'm going to block off the coop from the ducks which will make the ducks fill up off of the nutrena, is that all I need to do? Do I need to supplement too? If so, How? Thank you!