Prevention and treatment of pseudopregnancy in sows with conception but no piglets

After estrus mating, the sows had no obvious symptoms of return to estrus and were in a state of pregnancy. With the passage of time, sows appear symptoms similar to normal pregnancy, at the end of pregnancy, although there are delivery symptoms, but no piglets give birth to the disease called sow pseudopregnancy. After false pregnancy of sows, feed was consumed for a long time, and the breeding plan failed, resulting in losses. Now the prevention and treatment of pseudopregnancy in sows are introduced as follows for readers' reference.

Sow

1. Clinical symptoms: pseudo-pregnant sows showed almost normal estrus. After mating, sows had similar normal pregnancy reaction, slow action, gradual recovery of fat, slightly enlarged abdomen, but not obvious. Before delivery, sick pigs have the behavior of making nests with grass, restless movement, increased excretion, swelling of the vulva, but no mucus outflow. Although the breasts are obviously swollen, the milk can be extruded, but the milk is few and thin. During delivery, sows have obvious symptoms of delivery and contraction. After several contraction, there was no amniotic fluid outflow, and the abdominal circumference suddenly shrunk, resulting in no piglet production.

two。 Clinical diagnosis: false pregnancy can occur in sows of different breeds, ages and parities in four seasons. Even when the pseudopregnant sow is standing, there is no obvious change in the abdomen and no obvious depression in the back; when lying still, there is no fetal movement; the hand touches the abdomen, the fetus cannot be touched, and the fetal movement can not be felt.

3. Etiological analysis: (1) after estrus, sows did not get pregnant after natural mating or artificial insemination. However, the corpus luteum formed on the ovary not only did not degenerate, but also continued to secrete progesterone, resulting in similar pregnancy performance. (2) the sow lactation time is long, the body condition is thin, the fat loss is serious, the body reserve nutrition consumes massively, even appears the lactation paralysis, causes the sow hormone secretion regulation function disorder. (3) imbalance of feed nutrition. Long-term feeding single feed, lack of vitamins and trace elements, especially VE deficiency. (4) Reproductive tract diseases lead to ovarian dysfunction. (5) misuse and abuse of hormone drugs to induce estrus. (6) parasites invade the reproductive system.

4. Comprehensive prevention and control: (1) do a good job of feeding in stages to prevent sows from being too fat and too thin. Provide green feed as much as possible, pay attention to VE supplement, add sodium selenite VE powder, or feed sows with germinated barley. (2) if the sow is in estrus abnormality, do not rush to breed, should take targeted treatment measures. In the natural state, after normal estrus, mating is carried out. (3) do well the "short-term preferential feeding" of weaned sows. Sows that have just been weaned and isolated should strengthen feeding management and supplement protein feed appropriately. After each weaning isolation, a deworming and epidemic prevention should be carried out. Sows with poor body condition should be bred after their body condition has been effectively restored. (4) carefully observe the behavior of sows after mating, find pseudo-pregnant sows, and take measures as soon as possible to terminate pseudo-pregnancy. (5) to prevent the effect of reproductive tract diseases on ovarian function, penicillin was injected intramuscularly in sows twice a day for 3 consecutive days. (6) to select hormone drugs to induce estrus, it is best to mate in the state of natural estrus. (7) combined with drug therapy: intramuscular injection of prostaglandin 1mg, or methyltestosterone 1mg.