1. Strengthen management
1.1 Firstly, the sows should be selected for health use, normal heat, and easy pregnancy; secondly, the sows and gilts should be monitored, immunized, and treated for various diseases that affect their conception; if necessary, they can be eliminated; When the sow is again pregnant, delivery room hygiene should be qualified, and delivery personnel should be skilled in delivery techniques to prevent the occurrence of endometritis.
1.2 Due to factors such as mycotoxin, hot weather, excessive fat or excessive weight, and insufficient vitamin A, E, and D in feed, the sows' conception rate can be reduced. Therefore, the sow feed should be rich in nutrition, good in quality, clean and fresh, and should be Allow sows to exercise properly and limit feeding to ensure that the sows are in good condition.
2. Semen selection
In order to increase the sow’s conception rate, semen produced by male boars with good health, sexual desire, large ejaculation, and high sperm motility should be collected, and scientifically diluted, preserved, and rigorously subjected to quality inspection after sperm collection to find that sperm motility is low. , abnormal and thin semen should be thrown away.
3. Matching timing
3.1 estrus identification
Excited sows with estrusism, loss of appetite or food, arches or jumps, squeaks, and actively receiving boars across or across other sows. The vulva is moist, swollen, congested, light red, or purple. Frequent urination, press the back of the waist, bow back, tail tilt, standing still, pushing his hips forward reaction is stronger, with the device to pick their vulva when standing still.
3.2 breeding time
When the first sow is mated, it should not only achieve sexual maturity but also reach maturity. The estrus sow that meets the initial allocation requirements will perform the first breeding on the morning of the second day of estrus, and will be bred once every 10 hours or so, and the continuous breeding. 2 to 3 times, within 2 days; After giving birth, the sows are estrused in the morning on the same day in the afternoon, on the second day, in the afternoon, on the 2nd and 3rd in the afternoon respectively. In the afternoon on the 2nd day of the estrus, the 1st 3 days, afternoon, respectively, with the first 2 and 3 times, 2d distribution.
In the summer, they should be bred in the morning when the ambient temperature is low or after 6 p.m.. The sows should be fasted (2h after food or 1h before food), and the gilts in the estrus should be estrus 7 days later or the gilts with late estrus should be bred. Should be equipped with estrus.
4 breeding methods
4.1 The mating methods of pigs include natural mating, artificial assisted mating and artificial insemination. The natural mating is where boars and sows are kept together and mate when they are estrus. Artificially assisted mating is where boars and sows are kept separately and only when they are mated. The fixed place allows them to meet each other, and requires manual assistance in mating. Artificial insemination is a method of collecting boar semen using a collection device, checking and processing, and then injecting into the uterus of pregnant females to make them pregnant.
4.2 Compared with artificial insemination and natural mating and artificial assisted mating, it not only utilizes the resources of elite boar species more effectively, accelerates the breeding of fine breeds, reduces the spread of related diseases, significantly increases the proportion of sows and boars, and reduces breeding stocks. The advantage of pig cost, more importantly, it can effectively improve the conception rate, so artificial insemination should be advocated for breeding.
4.3 When the artificial insemination technicians left hand to grasp the female vagina, the right hand will insert the sperm into the vagina about 40cm, feel the resistance when the semen slowly injected, the insemination after the infusion bottle is lowered about 5s, if there is semen back Then return the semen input, without the return of the semen, the outer end of the vas deferens is folded and locked with a sperm bottle for 5 to 10 minutes and slowly pulled out.
5. Pregnancy diagnosis
Pregnancy diagnosis is a means of judging whether or not a sow has been pregnant by means of ultrasonic examination or estrogen determination about one month after the sow's next affection period through the non-return situation observation, boar trial or breeding. , found that unsuccessful breeding sows were not matched or eliminated in time.
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