Methods: Adopting the dog vomiting model induced levodopa and the pigeon vomiting model induced copper sulfate, observeing the vomiting times and delitescence, frequency and range of gastric motility and the gastric emptying rate.

• 方法 :采用左旋多巴导致家犬呕吐和硫酸铜导致家鸽呕吐模型 ,观察动物呕吐次数和潜伏期、胃运动频率和幅度、胃排空率的变化。