I have a month old gosling that wont stand up. He was fine last night when I checked on him, but this morning he wouldn't stand up. He seems fine physically, but like I said, he wont stand up. He is living outside in a cage with another gosling and some ducklings(I just put them out about 5 days ago). I`m really worried about him and don't know what to do for him. The only thing I can think is that I had to feed him some layer feed for a few days when we ran out of chick started(the starter is non medicated). Could layer feed do this to him? Someone in another post also mentioned a niacin deficiency. Could that be it? If so, is there something I can give him besides pure niacin until I can get to the store? How much should I give him? I have lots of B vitamins, but no B3.