Before the pig enters the circle, pour a large amount of water into the feces, let the place where the defecation is soaked and watch them pull the first bubble. If the pig has developed a bad habit of unreasonable pulling: It is recommended that the unwounded pig should be changed. Before the change, the pig's excrement should be caught first to the excretion opening of another circle, and then the pig should be transferred. Then be sure to watch the first time they are pulled in your position, up to a half-day, and do more with less. If there is no empty circle, clean the place where the urine is pulled, put dry lime or feed on it, and their feces catch the defecation mouth, just watch the door open at the first time. And urine.