摘要This study aimed to investigate the effects of different proportions of dietary fermented sweet potato residue(FSPR)supplementation as a substitute for corn on the nutrient digestibility,meat quality,and intestinal microbes of yellow-feathered broilers.Experiment 1(force-feeding)evaluated the nutrient composition and digestibility of mixtures with different proportions of sweet potato residue(70％,80％,90％,and 100％)before and after fermentation.In Experiment 2(metabolic growth),a total of 420 one-day-old yellow-feathered broilers were randomly allocated to 4 groups and fed corn-soybean meal-based diets with 0,5％,8％,and 10％FSPR as a substitute for corn.The force-feeding and metabolic growth experiments were performed for 9 and 70 d,respectively.The treatment of 70％sweet potato residue(after fermentation)had the highest levels of crude protein,ether extract,and crude fiber and improved the digestibility of crude protein and amino acids(P＜0.05).Although dietary FSPR supplementation at different levels had no significant effect on growth performance and intestinal morphology,it improved slaughter rate,half-chamber rate,full clearance rate,and meat color,as well as reduced cooking loss in the breast and thigh muscles(P＜0.05).Dietary supplementation with 8％and 10％FSPR increased the serum immunoglobulin M and immunoglobulin G levels in broilers(P＜0.05).Furthermore,10％FSPR increased the Shannon index and Ruminococcaceae_UCG-014,Ruminococcaceae_UCG-010 and Romboutsia abundances and decreased Sutterella and Megamonas abundances(P＜0.05).Spearman's correlation analysis showed that meat color was positively correlated with Ruminococcaceae_UCG-014(P＜0.05)and negatively correlated with Megamonas(P＜0.05).Collectively,70％sweet potato residue(after fermen-tation)had the best nutritional value and nutrient digestibility.Dietary supplementation with 8％to 10％FSPR as a substitute for corn can improve the slaughter performance,meat quality,and intestinal microbe profiles of broilers.Our findings suggest that FSPR has the potential to be used as a substitute for corn-soybean meals to improve the meat quality and intestinal health of broilers.