In recent years, in order to adapt to the residents' dietary structure adjustment and consumer demand for lean pork, the pig raising industry has continuously improved the level of industrialization and aquaculture efficiency, the pig breed has been rapidly improved, and the ternary goal of commodity pigs has been improved. The dual sow is gradually becoming the main body of fertile sows. However, relative to the soil species (local breeds), the sow sow modified and improved with the introduced pig breeds showed a change in reproductive physiology compared with the local breed sows, mainly due to the delay of the puberty period and the characteristics of the estrus. Minor, it is difficult to determine the appropriate breeding time. The clinical manifestation is that the breeding is not easy to be affected by the fetus, and the conception rate is lower, affecting the benefit of the pig raising and the improvement of the variety. In order to increase the abortion rate of the two-month sow, the farmers should do the following work.
Doing a good job of feeding and management
Compared with the indigenous sows, the sow has a large body size and consumes large amounts of nutrients, especially the sow producing sows. The born Sanyuanzi pig has a large initial size and a large amount of sucking milk. The lactation consumes the nutrient reserve of the pigs. In order to restore the sensation, the nutritional requirements are high. In order to maintain good reproductive performance and proper sensation, neither the pigs should be over-fat nor should the pigs be too thin. Therefore, we must strengthen feeding and management, especially the arrangement of the diet, to achieve scientific feed formulation, reasonable feeding, conditional best to arrange some green feed and juicy feed in the diet, in order to ensure quality, feed circulation is faster .
Emphasis on estrus identification
In order to catch the best time for breeding, estrus identification can adopt the "one-see, two-listen, three-click" method, that is, to see the sow's vulva changes and behavior changes, listen to the voice of the sow, press the estrus sow on the back . In the case of estrus in the sow, the main performances are as follows: The earliest vulva swells, but the insemination should be controlled when the swelling of the vulva subsides until there is a pronounced fold, which basically returns to the condition before the estrus. At the same time as the puke is swollen, the color also changes, and gradually fades in the middle and late stages. It is advisable that the insemination period be appropriate for the recovery of the color of the vulva near normal time (pink). In addition, in the early stage of the estrus, the sow of the binary sow had less vaginal secretory mucus, which was slightly white and had a short duration. Afterwards, it gradually increased, thinned, and then became transparent. This type of symptom persisted for a long time; it became thicker and less in the later stage. It is more appropriate to inseminate when there is no more mucus at the end of the vulva. Most of the changes in behavior are quiet, and a few are excitatory and recessive. In the early stage of estrus, the performance of the estrus was disturbed, walking, and slight crawling behavior; in the middle and late stages, it was daze and standing, and it was sensitive to sound stimulation. In the early stages of estrus, squeaks are often heard. The sound is short, low, and low. It is intermittent. Be aware of it. After the estrus was pressed, the back showed a "dwelling reaction." It is difficult to identify the initial estrus of gilts, and special attention should be paid to observation. Once a suspected situation is found, it is in sight. Observe the situation of the pigs observed several times a day, observe the combination of the age of the sows to conduct a comprehensive analysis, conditional boars, can greatly improve the accuracy of the judgment.
Good semen quality
The quality of boar semen is particularly important in bisexual sows mating, which is mainly determined by the characteristics of the sow's own traits. The external characteristics are not obvious during estrus and it is not easy to judge and identify. Therefore, the breeding time is difficult to grasp. The superiority of high-quality semen in vitality and survival time enables measures to increase the conception rate through multiple inseminations. At the same time, quality breeding pig semen is also a need for variety improvement. Therefore, attention should be paid to semen identification prior to insemination, and the natural mating method must be used to determine the age and health status of the boars, especially the recent mating, to ensure that boars have enough rest.
Increase the amount and frequency of insemination
The use of artificial insemination can increase the amount of insemination of the breeding period. It can be started from the following two aspects: first, increase the amount of insemination in a single dose; the amount of insemination should be between 60 ml and 80 ml; and second, increase the frequency of insemination, since The sows start their inseminations and insemination once every 8 hours to 12 hours, 2 to 3 consecutive inseminations, mating by natural mating, and then compounding can increase the conception rate.
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