In swine, the vagina becomes progressively smaller as it approaches the cervix and forms a smooth junction. The central canal of the cervix in the pig is a left-handed, or counterclockwise spiral. Specialized catheters with left-

handed spirals or compressible foam tips are used for insemination. Insemination doses are packaged in small bottles, tubes, or flexible bags. With the tip pointed up, the catheter is passed through the vulva and into the vagina until resistance is encountered. The catheter is then rotated counterclockwise. When rotation becomes difficult, insertion is stopped the insemination dose is connected, and the semen is slowly deposited. Physical stimulation of the sow by massaging her back and rear enhances sperm deposition and transport of semen inside the sow.

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