饲粮纤维对猪肠道生理功能影响的研究进展OA

In China's pig production,the promotion and use of diversified diets of miscellaneous grains and meals provides an important technical guarantee for alleviating the shortage of feed resources and reducing the risk of food security.As the main nutritional component of non-grain feed raw materials,dietary fiber plays a key role in regulating intestinal health of pigs at different growth stages.Dietary fiber is degraded by microor-ganisms in the digestive tract to produce metabolites such as short-chain fatty acids,which can effectively regu-late the energy metabolism of intestinal epithelial cells,promote cell proliferation and differentiation,and main-tain the structural integrity and functional integrity of the intestinal barrier.At the same time,the effect of dieta-ry fiber on intestinal physiology varies with its physical and chemical properties.Soluble dietary fiber is com-bined with water in the digestive tract of pigs,which makes the physical properties of chyme turn to a viscous state,thus delaying the transport rate of chyme in the intestinal lumen and prolonging the digestion and absorp-tion time of nutrients.Insoluble dietary fiber can increase the transport rate of intestinal chyme,shorten the fer-mentation time of nutrients in the cecum and colon,and increase the output of chyme due to its low water-hold-ing capacity.This paper summarizes the definition and classification system of dietary fiber,and focuses on its regulation on intestinal physiological state,microbiota and intestinal barrier function in pigs,in order to provide reference for the efficient utilization of unconventional feed resources and the regulation of intestinal health through dietary fiber nutritional characteristics to improve pig performance.