Effects of dietary chlorogenic acid on ileal intestinal morphology, barrier function, immune factors and gut microbiota of broilers under high stocking density stress oleh Yu-Qian Li, Yu-Qian Li, Yi Zhang, Yi Zhang, Dong-Ying Bai, Dong-Ying Bai, Yan-Hao Liu, Xiang-Long He, Koichi Ito, Ke-Xin Liu, Hai-Qiu Tan, Wen-Rui Zhen, Wen-Rui Zhen, Cai Zhang, Cai Zhang, Bing-Kun Zhang, Yan-Bo Ma, Yan-Bo Ma, Yan-Bo Ma