Sow conception rate is the percentage of the number of estrus during the period of maternal sow mating within a certain period. The rate of conception directly affects the fertility of sows, so raising the sow pregnancy rate is to increase sow reproduction. The effective means of force, how can we improve sow fertility?
1. Strengthen management
1.1 First of all, the sows should be selected for physical health, estrus normal, and easy to be pregnant; second trimester sows should be qualified when delivery room hygiene, birth attendants shall be skilled in delivery techniques to prevent the occurrence of endometritis.
1.2 sows feed should be rich in nutrients, good quality, clean and fresh, at the same time should allow the sow to exercise and limit feeding, to ensure that the first-class sensation.
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 viability should be collected. Digestion, preservation, and strict quality inspection should be conducted after sperm collection to find that sperm activity 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
The estrus sows that have reached the initial age of mating have their first mating on the morning of the second day of estrus. After that, they are bred once every 10 hours or so and are continuously bred for two or three times. We perform the second breeding on the second day in the morning, the first on the second day of the afternoon estrus, and the second on the third day of the morning.
In the summer, they should be bred in the morning when the ambient temperature is low or after 6 p.m.. The sow should be fasted (2h after eating or 1h before eating), and the gilts in the estrus after 7 days of weaning or the gilts with late estrus should be bred. Should be allocated on the day of heat.
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, artificial assisted mating not only effectively improve the use of resources for elite boars, speed up the breeding of good breeds, but also reduce the spread of related diseases, significantly increase the proportion of sows and boars, and thus reduce breeding species. The boar cost, more importantly, can effectively increase the sow's conception rate.
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 breeding unsuccessful sows in time or multiple infertility pairs were eliminated.
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