There are three key periods in embryonic death

After sows are pregnant, there are three special periods that are likely to cause embryonic death: 9 to 13 days, 18 to 24 days, and 60 to 70 days. The first peak appeared in 9-13 days. At this time, the fertilized egg began to come into contact with the uterine wall and was ready to implant without being implanted. If the internal environment of the womb is disturbed, death is most likely to occur. The number of deaths at this stage accounted for 20% to 25% of the total number of embryos. The second peak occurred in 18 to 24 days. At this time, embryonic organs were formed. During the competition for the substances secreted by the blastoderm, the weak died. The number of deaths at this stage accounted for 10% to 15% of the total number of embryos. The third peak occurred at 60-70 days. At this time, the blastoderm ceased to develop, and the fetus grew rapidly. Insufficient nutrient supply could cause embryonic death. The number of deaths at this stage accounted for 5% to 10% of the total number of embryos.

Sow Pregnancy Measures During Pregnancy

1. Keep quiet. In the peak period of embryonic death, if the sow is disturbed or disturbed, it will easily lead to metabolic disorders, and the intrauterine environment will be inhibited to varying degrees, which may increase the number of embryonic deaths. Therefore, during pregnancy, it is necessary to keep the shed quiet, avoid being close to strangers, prevent harassment of pets or small animals, prohibit strong noise, and do not rush, sow the sow, and ensure that the sow is free from any interference.

2. Strengthen management. Feeds for pregnant sows must be of good quality and must not be used for mildew, contamination, frozen feed, or silage. In summer, the rate of mating stillbirth is higher. Various measures must be taken to control the small environment inside the pig house. The ambient temperature should be controlled at 15~25°C and the relative humidity should be controlled at 70%~80%.

3. Control the amount of feed. After mating, the sows become very quiet and their feed intake increases rapidly. If they are allowed to feed freely, body lice will increase rapidly. This will not only result in stillbirth, but also cause difficulties in childbirth. During the pre-pregnancy period (within 21 days after mating), the daily feed volume was 2 kg, the mid-gestation period (22-60 days) was 2.5 kg daily, and the late-gestation period was 3 kg daily, and the net weight gain during pregnancy was maintained at about 20 kg.

4. Drug miscarriage. Sows who are habitually miscarried can use early progestational hormones to soothe their fetuses, that is, about 7 days after mating, sows are given intramuscular injections of 15 to 25 mg of progesterone. When it is usually found that there are signs of miscarriage, progesterone should be given in time for fetal miscarriage. The effect of TCM is better, 21 days after mating, use 20 grams of Codonopsis, Radix Astragali, Angelica, Dipsacus, Astragalus, Atractylodes, Amomum each, 15 grams of each of Chuanxiong and Lingcao, and add 100 grams of decoction to the residue. Glutinous rice, boiled porridge and fed to sows, one dose per day for 2 days.

5. Prevent diseases. There are many infectious diseases that cause sows abortions and stillbirths, including swine fever, porcine reproductive and respiratory syndrome, pseudorabies, parvovirus, Japanese encephalitis, influenza, brucellosis, eperythrozoonosis, Leptospirosis, chlamydia, etc., the most common of which are parvovirus and Japanese encephalitis, must be well vaccinated. Parvovirus vaccine can be inoculated 2 to 4 weeks before sow mating, male boars are vaccinated once every six months, Japanese encephalitis vaccine is usually inoculated from April to May, and first-born sows must be injected.

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