Each of model group was fed by orogastric intubation with Vitamin D3 (500000 IU/kg) within 3 days, and then fed with a high-fat diet for 21 days.

• 模型组，连续三天灌胃给予VitD3（总量为50万单位/kg），之后用高脂饲料以15g/只/天喂养21天。