1. Natural mating: The natural mating is to keep the male and female pigs together, and the boar is free to mate with the estrus sow. Usually 15 to 20 sows are placed in a boar and allowed to naturally mate. This can easily lead to illegal distribution of male and female sows, sows lack of breeding records, can not predict the expected date of birth, boar abuse, excessive use, affect health, this breeding method has been rarely used in pig production.
2. Artificially assisted mating: Boars that are artificially assisted in mating are usually not kept together. When the sow is in estrus, the sows are rushed to the designated place to mate with the boars or the boars are rushed to the sow pens for mating. When the boar climbs onto the sow's back, the assistant pulls the sow's tail away by hand, and the other hand pulls the boar's foreskin to guide the penis into the vagina. Then observe the ejaculation situation of the boar. When the boar ejaculates, the boar will be driven off immediately to avoid a second mating. This method can use the boar rationally.
3. Artificial insemination: Artificial insemination is a technique for collecting semen of a boar by human means and then inputting the sow's uterus in a certain way to make the sow pregnant. Specific practice Xiang Xiang see the relevant content. In situations where artificial insemination techniques are not very skilled, the rate of conception using artificial insemination will be lower than that of assisted mating. At present, more pig farms use an artificial assisted mating and 1 to 2 artificial inseminations in one estrus. Artificial assisted mating in the morning, artificial insemination in the afternoon, and artificial insemination in the next morning, the average fertility rate can reach 93. %. The rate of insemination should not be as fast as 5 to 8 minutes.
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