Sow fertility is one of the most important aspect for a pig farm. Because the number of piglets determines the interests of most pig farms, pig farmers have always spent a lot of effort on sows.
What should you do if the sow does not match the species?
Today, I have compiled a series of three artificial insemination techniques for pig farms.
First of all, we must accurately determine the period of sow estrus.
According to the reaction of the sow and the changes of the reproductive organs, the symptoms of estrus can be divided into three stages.
Pre-estrus: Sows are uneasy, loss of appetite, tweet, crawl across other sows, genital enlargement, vaginal mucosa is reddish, but boars are not accepted, this period lasts 12 to 36 hours.
In the middle of estrus: the sow continues to be uneasy, the appetite is severely diminished, sometimes it stands still, the ears are vibrating, and sometimes it crawls across other sows, the vulva is swollen, the vaginal mucosa is dark red, the mucus is thin and transparent, and it is willing to mate with the boar. A standing reflection occurs. This period lasts 6-36 hours, which is the best time for insemination.
Late estrus: the sow tends to be stable, the vulva begins to shrink, the vaginal mucosa is lavender, the mucus is thick, and it is unwilling to accept boar. This period lasts for 12-24 hours.
Secondly,artificial insemination is key.
Before artificial insemination, the operator washes his hands and rinses the disinfected insemination equipment (30-50 ml plastic semen bottles and plastic pig artificial insemination catheter) with a small amount of diluent.
The semen was warmed to 35-38 ° C at a rate of 1 ° C per 2 minutes. The sow’s genital area was disinfected with a 0.1% potassium permanganate solution.
Then open the vulva of the sow in one hand, insert a vas deferens into the vagina, first push it about 10 cm obliquely upwards, and then push it to the horizontal direction about 30 cm.
When the hand feels that it can no longer be pushed, the vas deferens has been inserted into the uterus. Next slowly inject the semen. If semen countercurrent occurs, the injection can be paused. After the vas deferens, move it again until the semen is fully input, and then slowly withdraw the ejaculation hose.
Thirdly,grasp the timing of pig mating.
Generally, sows begin to ovulate after estrus 24-36 hours, ovulation lasts for 10-15 hours, and the discharged eggs maintain fertilization ability for 8-12 hours. The time for sperm to remain fertilized in the reproductive organs of the sow is 10-20 hours. After the breeding, the time required for the sperm to reach the fertilization site is 2-3 hours.
Based on this calculation, the appropriate mating or insemination time is 20-30 hours after the sow’s estrus.
Mating is too early, when the egg is discharged, the sperm has lost fertilization ability; mating too late, when the sperm enters the reproductive tract of the sow, the egg has lost fertilization ability.
Both will affect the conception rate, even if fertilization may die due to the lack of vitality of the bond. However, in production practice, it is generally impossible to grasp the estrus. At this time, careful observation is required.