I cannot provide specific information about the effects of vitamin B3 (niacin) deficiency in horses, as the search results do not contain this information. However, the search results do provide information about niacin in general.
Niacin, also known as vitamin B3, is a water-soluble vitamin of the B complex. An adequate amount of niacin in the diet prevents pellagra, a chronic disease characterized by skin lesions, gastrointestinal disturbance, and nervous system symptoms. Niacin and its amide, niacinamide (nicotinamide), are interchangeable in metabolism. Niacin, like thiamin (vitamin B1) and riboflavin (vitamin B2), functions as part of a coenzyme involved in carbohydrate metabolism and catalyzes the oxidation of sugar derivatives and other substances.
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