Cultured Milk Products/microbiology; Edible Grain/microbiology; Lactobacillus/isolation & purification; Lactobacillus/physiology; Probiotics/pharmacology; Animals; Anti-Bacterial Agents/pharmacology; Bacterial Adhesion; Bile Acids and Salts/metabolism; Body Weight/drug effects; Caco-2 Cells; Cholesterol/blood; Cholesterol/metabolism; Drug Resistance, Bacterial; Eating/drug effects; Feces/microbiology; Humans; Hydrogen-Ion Concentration; Hypolipidemic Agents/metabolism; Hypolipidemic Agents/pharmacology; Intestines/microbiology; Lactobacillus/drug effects; Lactobacillus/metabolism; Liver/drug effects; Liver/metabolism; Male; Probiotics/metabolism; Rats; Rats, Sprague-Dawley; Species Specificity; Tibet