Pig artificial insemination: when to inseminate and inseminate? What are the technologies?

Pig artificial insemination is one of the economical and effective technical measures in pig production, and it is a technical means to apply artificial insemination to pigs. When will the pig be inseminated and inseminated? What are the technologies? Let's take a look at it.

I. purchase, transportation and storage of semen

In practice, the safe transportation and proper storage of semen before the purchase of semen by farmers is the guarantee to prolong the sperm survival time and improve the sperm motility. In general, the fresh essence is stable in the first 48-72 hours after dilution and repackaging. Three important points should be achieved in semen transportation and preservation: first, to prevent concussion, second, to avoid light, and third, to control the preservation temperature at 15: 20 ℃, 17 ℃ is the most ideal temperature.

2. Determination of oestrus and timely mating of sows

Timely insemination must grasp the symptoms of estrus, in the actual operation to achieve "four look" and "one press", that is, a look at the vulva, from hyperemia, redness and swelling to purple red and dark and wrinkles; second, mucus from sparse to thick and silky; third, expression, daze; fourth, look at age, as the saying goes, the old match is early, the little match is late, the young many are in the middle, the general parturition sow estrus 3048 hours, the first mating sow 48 hours after insemination. "one press", that is, pressing the sow's back, waist and hips with both hands is the best breeding time.

Third, it is a scientific method of insemination.

The bionic insemination technology imitates the natural mating action of pigs and twists and pulls the vas deferens to produce suction at the inner mouth of the cervix of sows, so as to automatically inject semen into the body of sows. Bionic insemination technology can effectively prevent the reflux of clear fluid and further improve the conception rate and litter size of pig artificial insemination.

Repeated insemination requires 2 or 3 times of semen insemination in a period of estrus. In practice, our practice is to inseminate once every 6 to 8 hours. The comparative experiment on insemination of 50 fertile sows in our field shows that the conception rate of repeated insemination is 5% higher than that of one insemination, and the litter size per litter is increased by 3.

Interval estrus insemination method, the so-called interval estrus insemination method refers to this estrus without insemination in the next semen method. Our specific practice is to breed the sows in the second estrus after weaning, and the first gilts can inseminate in the third estrus. Due to the large energy consumption of the parturient sows during the lactation period, the various functions of the body are still in the recovery period, and all the functions of the sows have resumed estrus after an interval of estrus. At this time, the insemination sows have not reached body maturity, which is not conducive to the growth and development of the pregnant fetus. It also affects the service life of sows.

Fourth, master the "four noes and five essentials" in the operation of artificial insemination.

Four no: that is, inaccurate no insemination; insemination instruments and sow vulva do not disinfect semen; sows with hysteritis and vaginitis do not inseminate; pregnant sows do not prevent epidemic and deworming in the early stage.

Five to: that is, first, to grasp the estrus period; second, to disinfect instruments and maternal vulva; third, to treat sows suffering from hysteritis and vaginitis before breeding, mild reproductive system inflammation can be diluted and rinsed with gentamicin and distilled water the day before insemination, and add a gentamicin mixed with semen during insemination; fourth, keep sows 70 to 80% fat; fifth, do a good job of deworming and epidemic prevention before breeding.