It is understood that in recent years, the stillbirth rate of gilts in the primiparous sows has increased rapidly. Some dead pigs have a dead rate of 70%-80%. There are a few pig farms with dozens of sows, hundreds of babies, few survives, and the economy. The loss is great.
(1) The reason for the high rate of stillbirth in primiparous sows is that primiparous sows have poor resistance to reproductive disorders. At present, sow reproductive disorders are most seriously jeopardized by Japanese encephalitis, parvovirus and pseudorabies.
1 Japanese encephalitis is transmitted by mosquitoes, flies, and ticks, usually in the late summer and early autumn. When a pregnant sow develops a toxemia, the virus infects the fetus through the placenta and causes a miscarriage. The early death of the fetus forms a mummy (dry corpse), and most of the later deaths are stillbirths. The stillbirth is not corrupt, some body edema, chest, and abdominal water; some noses and torso are blue-purple, and the sows (more than 2 births) have A certain amount of immunity, the number of stillbirths is reduced.
2 parvovirus disease is infected by contact. Sows are infected with the disease 35 days before pregnancy, and the dead embryos are mostly absorbed by the sows, resulting in a decrease in the number of live births. When the sows are infected for about 3 months, some or all of the fetuses die.
3 Pseudorabies is a contact infectious disease shared by livestock and wild animals. It is transmitted by rodents. It can also be transmitted through the respiratory tract, digestive tract, breastfeeding, and natural mating. It is prone to winter and spring, and some sows have miscarriage or birth. Mummy fetus, stillbirth and placenta are spoiled, stench, sows often dark brown mucus or "white".
(2) Swine fever virus, porcine transmissible gastroenteritis virus, myocarditis virus, swine plague virus, swine flu virus, etc. can cause abortion or stillbirth in certain conditions under certain conditions, and some bacterial infectious diseases can also cause Sow abortion, such as Pasteurellosis, leptospirosis, Listeriosis, swine toxoplasmosis, swine chlamydia, porcine erythroblastosis.
(3) Poor management and feeding can also cause sow abortion. Such as: excessive density, crowding, feed mildew poisoning, drinking ice water, habitual abortion, sow fighting, climbing, jumping, chasing, bruising, catching pigs, thundering or loud noise, etc. Both can cause abortion or stillbirth.
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