Effects of Alfalfa Saponins on Growth Performance and Antioxidant Properties of Weaned Piglets Effects of alfalfa saponins on the nutrient digestibility, production performance and blood biochemical index of weaned piglets Effects of fructo-oligosaccharides on mucosal morphology, digestive enzyme activity, organic acid and Lactobacillus of the gastrointestinal tract of unweaned piglets Effects of alfalfa saponins on the lipid metabolism, antioxidation and immunity of weaned piglets