Identification and control measures of reproductive disorders in sows (1)

The main diseases causing reproductive disorders in sows are porcine parvovirus disease, porcine Japanese encephalitis, porcine pseudorabies, swine blue ear disease, swine fever, porcine leptospirosis, porcine toxoplasmosis, brucellosis and so on.

1 to distinguish from the epidemiological characteristics

1.1 popular season

Porcine epidemic encephalitis B has obvious seasonality, that is, mosquito activity occurs more frequently in summer and autumn, leptospirosis mainly occurs in the high temperature season from July to October, and porcine pseudorabies mostly occurs in spring and winter. several other diseases have no obvious seasonality and can occur in all seasons.

1.2 Age of onset

The susceptibility to brucellosis and parvovirus disease increases with sexual maturity; leptospirosis occurs frequently in young animals; toxoplasmosis mainly occurs in pigs aged 3-4 months, and the other four diseases are susceptible in different age groups. However, there are significant age differences in clinical manifestations between porcine blue ear disease and porcine pseudorabies.

1.3 ways of transmission

Porcine parvovirus disease is transmitted through contact with pollution sources, placenta and semen; porcine encephalitis B is mainly transmitted through mosquito bites; porcine pseudorabies is mainly transmitted through respiratory tract, digestive tract and damaged skin; porcine blue ear disease is transmitted through direct contact; classical swine fever is transmitted through respiratory tract (tonsil) or direct contact Leptospira is mainly transmitted through skin, mucosa and digestive tract, and can also be transmitted by blood-sucking insects during mating, artificial insemination or bacteremia. Porcine brucellosis is transmitted through digestive tract, skin trauma and mating.

2 to make a difference in terms of clinical symptoms

The common symptoms of the diseased sows were repeated infertility, abortion or stillbirth, mummified fetus, weak vitality of newborn piglets and so on. In addition to the above symptoms, sows have no other symptoms, and most other pigs are asymptomatic; Japanese encephalitis pigs mostly have neurological symptoms, high fever, mild hindlimb paralysis; pseudorabies newborn piglets have serious symptoms, high fever, dyspnea, limb movement disorders, circle, vomiting, dysentery, if the neurological symptoms appear in the early stage of the disease, the mortality rate can reach 100%, the symptoms of young pigs are mild, and the fatality rate is relatively mild.

Low; piglets with blue ear disease showed rapid abdominal breathing or wheezing, with a mortality rate of 80%-100%. A large number of piglets died after weaning in epidemic areas, and respiratory symptoms were dominant in young pigs; most of leptospirosis pigs showed recessive infection after infection, there were no obvious clinical symptoms, a few showed acute course, showing short-term fever, anemia, jaundice and so on. Porcine toxoplasmosis occurs frequently in pigs aged 3 ~ 4 months, showing high fever, dyspnea, watery diarrhea in piglets, recovery after half a month, and recessive process in adult pigs; swine fever, porcine blue ear disease and porcine toxoplasmosis all have bleeding and purplish skin in the ear, auricle, abdomen and medial leg; porcine parvovirus disease, porcine pseudorabies, porcine blue ear disease, brucellosis and toxoplasmosis are asymptomatic abortion and stillbirth in sows. Swine encephalitis, swine fever, swine leptospirosis sows showed fever and other symptomatic abortions and stillbirths.