Description: The image on the right is of a large intestine from a niacin deficient pig as compared to the control on the left. The large intestine of the deficient pig has thickened with hemorrhagic lesions of the mucous membrane and has denuded areas due to the deficiency. The ulcerative necrotic lesions can also contain fusiform bacteria and spirochetes as a secondary infection causing infectious enteritis. This is often associated with diarrhea and foul smelling feces. These conditions could be due to the niacin deficiency, or to the bacterial infection, or to both. Deficient pigs can be treated with niacin supplementation. This will not relieve the bacterial infection but will help the pig to maintain its resistance against the bacteria. More information is also available in the article â€œNiacin Deficiency and Enteritis in Growing Pigsâ€ by Wise Burroughs et al.,(1951) Journal of Nutrition, 41, 51-62.