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Any luck?

I need everyone's help. I have this picture but I cannot find the source I copied it from. :hide I copied it to my drive April 20, 2018, and it came from poultrydvm or duckdvm.

http://www.poultrydvm.com/condition/niacin-deficiency http://www.poultrydvm.com/drugs/niacin http://www.duckdvm.com/condition/niacin-deficiency https://www.merckvetmanual.com/poultry/nutrition-and-management-poultry/vitamin-deficiencies-in-poultry