Blue-ear disease of pigs is extremely harmful to pig farms. There is no treatment but prevention.
Release time:
Aug 15,2018
Blue-ear disease in80The United States was discovered for the first time.90It has spread to some European countries. China is in2006An outbreak of blue ear disease in 2010 was followed by the isolation of highly pathogenic strains. Blue ear disease has a great impact on pig farms. The main symptoms are reproductive disorders, respiratory diseases, slow growth and increased mortality. At present, the origin of blue ear disease is unknown, endemic in most parts of the world and difficult to control.
Route of transmission:
Infected animals through saliva, nasal secretions, urine, semen discharge virus, occasionally by fecal detoxification, late pregnancy infected sows can be excreted virus through milk.
Pigs are mainly transmitted through the nasal cavity, oral cavity, vagina, etc., but also through the damaged skin, including tooth cutting, tail cutting, ear cutting, injection of drugs and vaccines. Pregnant sows can be transmitted vertically to piglets through the placenta, causing stillbirth and weak litters.
symptoms of blue ear disease:
1Sow
Acute infection stage has1%-3%of the sow abortion, abortion often occurs after pregnancy21-109Day. There are5%-80%The sow will be after pregnancy100-118Day litter, the fetus produced by normal pigs, weak piglets, fresh stillbirth and mummified fetus. In general, stillbirths account for a litter of piglets0-100%, accounting for the number of births of the whole group.7%-35%. This disease can persist4For months, the rate of slow estrus and infertility increased in tolerant sows.
2suckling piglets
Suckling piglets showed depression, weight loss, diarrhea, leg valgus, shortness of breath, difficulty breathing, eyelid edema. A small number of pigs can be seen in the ears, body surface skin purple. Necropsy showed interstitial pneumonia and enlarged lymph nodes.2-10Times, the initial lymph node edema was brown, then hardened, color becomes white or light brown.
3Growing and Fattening Pigs
The main manifestations of anorexia, depression, difficulty breathing or panting, ear, abdomen and tail skin has a transient dark purple. Usually mixed infection with other diseases causes increased death.
Prevention and control measures:
At present, there is no specific treatment for blue ear disease, only by strengthening the biosafety of pig farms, to avoid mutual infection between groups, reduce losses.
1Adhere to self-reproduction and self-support, not easy to introduce.
2, large-scale pig farms to implement all in and out, in strict accordance with the transfer standard.
32. Disinfection of empty houses requires thorough cleaning of pig houses before disinfection, and transfer to pigs after the houses are fully dried.
42. When the reserve pigs need to be introduced, they shall be domesticated first and then transferred to the pigs.
5The reserve sows and sow herds should determine the vaccine strain and immunization time according to the specific situation of the field.
6, regular laboratory testing of pig herd infection, do know fairly well.
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