1, the breeding time should be better than 2 hours after eating, summer hot weather should be carried out in the morning and before 6 o'clock in the afternoon. 2. The breeding site should be farther away from other boars, and the ground should be flat, but not smooth so as not to hurt the boar. 3. Keep the environment as quiet as possible during breeding. Do not shout or whip boars or sows. 4, after mating by hand in the lumbar region of the sow, prevention of semen back to cause empty or return. 5, rain or snow weather should be mated indoors. 6. Don't bathe, feed cold water, or lie in a cold, damp place immediately after mating, so that the boar does not get cold. 7. The proportion of male and female pigs should be appropriate. Generally, the proportion of 1:20-25 is appropriate. 8, the use of frequency: young boar 4-5 times / week, old boar 3 / week mating use.