I’m so sorry for your loss!
Others have suggested niacin deficiency which is a possibility but it could also be a thiamine deficiency or one of the other Bs, not enough vitamin E can also be a cause for nuerological issues. Maybe a good B mix, and a multivitamin mix is in order. Sometimes even with feed that’s made for waterfowl you can get part of a batch that just doesn’t have the right concentration.
Others have suggested niacin deficiency which is a possibility but it could also be a thiamine deficiency or one of the other Bs, not enough vitamin E can also be a cause for nuerological issues. Maybe a good B mix, and a multivitamin mix is in order. Sometimes even with feed that’s made for waterfowl you can get part of a batch that just doesn’t have the right concentration.