What is the cause of miscarriage in all stages of sows?

I. embryo loss during pregnancy

1. Sows do not have any symptoms, but have a small litter size.

2. Return to love (early abortion).

Causes: stress, feeding management errors, nutritional reasons (overeating), high temperature and so on.

II. Miscarriage that occurs at any time of pregnancy

1, the sow is thin, may be polyuric, irritated and thirsty, aborted fetus and placenta have no visual changes. Possible causes: nutritional reasons-insufficient food intake.

2. The symptoms of sows were not obvious or there were no clinical symptoms, and abortion occurred in all stages of pregnancy.

Fetal autolysis or subcutaneous edema, celiac effusion or bleeding, suppurative placenta inflammation. Possible cause: brucellosis.

The fetus or placenta is close to normal or some autolysis, edema, suppurative placentitis. Possible cause: uterine infection.

Fetal reabsorption, often mummified fetus, stillbirth or weak baby, the decomposed placenta wraps the fetus tightly. Possible cause: parvovirus.

The fetus has hydrocephalus, subcutaneous edema, pleural effusion, small bleeding spots, liver and spleen necrosis. Possible cause: encephalitis B.

3. Sows have symptoms such as sneezing, coughing, anorexia, constipation, salivation, vomiting, nerves, mummified fetus, dead fetus, focal necrotic area of fetal liver, or fetal reabsorption, necrotizing placentitis. Possible cause: pseudorabies.

4. Sows are extremely weak, sleepy, breathing hard, coughing; fetal reabsorption or mummified fetus, stillborn fetus and weak offspring. Possible cause: swine flu.

5. Sow drowsiness, anorexia, fever, conjunctivitis, vomiting, dyspnea, diarrhea, ataxia, convulsions, mummified fetus, stillbirth, fetal edema, malformation, bleeding, lung and cerebellar hypoplasia. Possible cause: classical swine fever.

6. Sows are asymptomatic or have elevated body temperature, miscarriage, stillbirth, weak babies, and occasional mummified fetuses. Possible cause: Toxoplasma gondii.

III. Miscarriage that occurs in the second and third trimester of pregnancy

1. Mild symptoms of sows, mild anorexia, fever, diarrhea, occasional abortion, diffuse placentitis, stillbirth, weak baby. Possible cause: Leptospira interrogans.

2, sow anorexia or lethargy, abortion, stillbirth, weak baby, no naked eye disease. Possible cause: T2 toxin poisoning.

4. Abortion occurs at any time of pregnancy, and most of the abortions of multiple sows occur during the same pregnancy.

1. Sows do not have any symptoms, but are relatively concentrated and seasonal, most of them occur from September to November, and the fetus and placenta often have no change. Possible cause: seasonal miscarriage.

2. there are blisters in the nasal disc, mouth and crown of sows, and there are no eye lesions in fetus and placenta. Possible cause: swine vesicular disease.

3. Sow fever, anorexia, lethargy, skin macular redness, cyanosis, fetal umbilical cord necrotizing arteritis, edema. Possible causes: porcine reproductive disorders and respiratory syndrome (blue ear disease).

4. Sows may be anorexic, febrile, depressed, rare corneal opacity, stillbirth, mummified fetus, abortion, fetal reabsorption. Possible cause: blue disease.

5. Systemic infection of sows.

5. Aborted sows are in the same group or in the same age group

Sows have no symptoms, lack of nutrition, mismanagement and other reasons, stillbirth or weak baby, no cleft palate, small eyes, blindness, systemic edema. Possible cause: vitamin A deficiency.

6. Abortion is a full-term stillbirth

1. Mummified fetus, stillbirth, light weight and deformity at birth. Possible cause: insect repellent poisoning.

2. Sows work hard for more than 5 hours, especially in large litter size or hot weather, sow mucous membrane is pale, breathing fast, fetus and placenta often have no visual changes. Possible causes: fatigue, low levels of hemoglobin in sows.

3. Sows are asymptomatic but often occur in the cold season, with bright red fetal tissue and a large amount of serous bloody fluid in the chest. Possible causes: carbon monoxide, carbon dioxide poisoning.

4. during the high temperature season, sows have asthma, hyperemia, trauma, etc., and the fetus and placenta often remain unchanged. Possible causes: high ambient temperature, trauma.

7. Embryo implantation failure and reproductive disorder of sows

Sow vulva swelling, edema, occasional breast swelling of parturient sows, abortion, stillbirth, weak baby, fetus without visual lesions. Possible cause: zearalenone poisoning.

VIII. Preventive measures

1. After pregnancy, sows are given sufficient and high-quality feed according to the nutritional needs of each pregnancy, and it is strictly forbidden to feed rotten, frozen and toxic feed; feeding should be fixed and quantitative to prevent overeating.

2. Give sows enough water to prevent binge drinking.

3. During pregnancy, sows should prevent squeezing, collision, falling, kicking and whipping to reduce stress.

4. Keep the fence house dry, keep warm in winter and cool down in summer.

5. Reasonable selection to prevent mismatch, mismatch and inbreeding.

6. Sows should be quarantined regularly, vaccinated and dewormed to prevent Japanese encephalitis and influenza and other diseases.

7. Long-term or regular use of health drugs to ensure the normal birth of sows.

8. Rational use of high-quality mildew products.

9. Sows with genetic defects and habitual abortion treatment should be resolutely eliminated.