Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 ChinaHunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production Key Laboratory of Agro-ecological Processes in Subtropical Region Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central Ministry of Agriculture Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha 410125 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 ChinaDepartment of Neuroscience Hengyang School of Medicine University of South China Hengyang 421000 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 China;
Laboratory of Animal Nutrition and Human Health Hunan International Joint Laboratory of Animal Intestinal Ecology and Health College of Life Science Hunan Normal University Changsha 410081 China;
Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production Key Laboratory of Agro-ecological Processes in Subtropical Region Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central Ministry of Agriculture Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha 410125 China;
Folic acid; Growth performance; Antibiotic-free; Intestinal morphology; Post-weaning piglet;