Niacin nutrition and rumen-protected niacin supplementation in dairy cows: an updated review.

Niacin nutrition and rumen-protected niacin supplementation in dairy cows: an updated review. Br J Nutr. 2019 Sep 02;:1-28 Authors: Chen J, Yang Z, Dong G Abstract As the precursor to nicotinamide adenine dinucleotide and nicotinamide adenine dinucleotide phosphate, niacin is important for catabolic and anabolic redox reactions. In addition, niacin is known for its antilipolytic action via a hydroxycarboxylic acid 2 (HCA2) receptor dependent mechanism. The antilipolytic effects of traditional free niacin supplementation during transition periods had been studied extensively, but the reported effects are ambiguous. In the past decade, a series of studies were conducted to evaluate the effects of rumen-protected niacin (RPN) on production performance and metabolic status in early lactation, and on heat stress in dairy cows. Feeding RPN seems more effective than free niacin regarding increasing circulating niacin concentration. The rebound of plasma non-esterified fatty acids (NEFA) was found after termination of niacin abomasal infusion. Feeding RPN or infusion of niacin via the abomasum could suppress lipolysis, and reduced insulin resistance in early lactation. Additionally, RPN supplementation could possibly relieve heat stress through vasodilation during moderate to severe heat stress condition. However, these beneficial effects of niacin supplementation have not always been observed. The inconsistent results across studies may be ...
Source: The British Journal of Nutrition - Category: Nutrition Authors: Tags: Br J Nutr Source Type: research